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The Literature Review

Primary and secondary sources, the literature review: primary and secondary sources.

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Can something be both a primary and secondary source?

Research for your literature review can be categorised as either primary or secondary in nature. The simplest definition of primary sources is either original information (such as survey data) or a first person account of an event (such as an interview transcript). Whereas secondary sources are any publshed or unpublished works that describe, summarise, analyse, evaluate, interpret or review primary source materials. Secondary sources can incorporate primary sources to support their arguments.

Ideally, good research should use a combination of both primary and secondary sources. For example, if a researcher were to investigate the introduction of a law and the impacts it had on a community, he/she might look at the transcripts of the parliamentary debates as well as the parliamentary commentary and news reporting surrounding the laws at the time. 

Examples of primary and secondary sources

Diaries Journal articles
Audio recordings Textbooks
Transcripts Dictionaries and encyclopaedias
Original manuscripts Biographies
Government documents Political commentary
Court records Blog posts
Speeches Newspaper articles
Empirical studies Theses
Statistical data Documentaries
Artworks Critical analyses
Film footage  
Photographs  

Primary vs secondary sources: The differences explained

Finding primary sources

  • VU Special Collections  - The Special Collections at Victoria University Library are a valuable research resource. The Collections have strong threads of radical literature, particularly Australian Communist literature, much of which is rare or unique. Women and urban planning also feature across the Collections. There are collections that give you a picture of the people who donated them like Ray Verrills, John McLaren, Sir Zelman Cowen, and Ruth & Maurie Crow. Other collections focus on Australia's neighbours – PNG and Timor-Leste.
  • POLICY - Sharing the latest in policy knowledge and evidence, this database supports enhanced learning, collaboration and contribution.
  • Indigenous Australia  -  The Indigenous Australia database represents the collections of the Aboriginal and Torres Strait Islander Commission Library.
  • Australian Heritage Bibliography - Aboriginal and Torres Strait Islander Subset (AHB-ATSIS)  - AHB is a bibliographic database that indexes and abstracts articles from published and unpublished material on Australia's natural and cultural environment. The AHB-ATSIS subset contains records that specifically relate to the Aboriginal and Torres Strait Islander peoples.include journal articles, unpublished reports, books, videos and conference proceedings from many different sources around Australia. Emphasis is placed on reports written or commissioned by government and non-government heritage agencies throughout the country.
  • ATSIhealth  - The Aboriginal and Torres Strait Islander Health Bibliography (ATSIhealth), compiled by Neil Thomson and Natalie Weissofner at the School of Indigenous Australian Studies, Kurongkurl Katitjin, Edith Cowan University, is a bibliographic database that indexes published and unpublished material on Australian Indigenous health. Source documents include theses, unpublished articles, government reports, conference papers, abstracts, book chapters, books, discussion and working papers, and statistical documents. 
  • National Archive of Australia  - The National Archives of Australia holds the memory of our nation and keeps vital Australian Government records safe. 
  • National Library of Australia: Manuscripts  - Manuscripts collection that is wide ranging and provides rich evidence of the lives and activities of Australians who have shaped our society.
  • National Library of Australia: Printed ephemera  - The National Library has been selectively collecting Australian printed ephemera since the early 1960s as a record of Australian life and social customs, popular culture, national events, and issues of national concern.
  • National Library of Australia: Oral history and folklore - The Library’s Oral History and Folklore Collection dates back to the 1950’s and includes a rich and diverse collection of interviews and recordings with Australians from all walks of life.
  • Historic Hansard - Commonwealth of Australia parliamentary debates presented in an easy-to-read format for historians and other lovers of political speech.
  • The Old Bailey Online - A fully searchable edition of the largest body of texts detailing the lives of non-elite people ever published, containing 197,745 criminal trials held at London's central criminal court.

Whether or not a source can be considered both primary and  secondary, depends on the context. In some instances, material may act as a secondary source for one research area, and as a primary source for another. For example, Niccolò Machiavelli’s The Prince , published in 1513, is an important secondary source for any study of the various Renaissance princes in the Medici family; but the same book is also a primary source for the political thought that was characteristic of the sixteenth century because it reflects the attitudes of a person living in the 1500s.

Source: Craver, 1999, as cited in University of South Australia Library. (2021, Oct 6).  Can something be a primary and secondary source?.  University of South Australia Library. https://guides.library.unisa.edu.au/historycultural/sourcetypes

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Literature Review Basics

  • Primary & Secondary Sources
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The Literature

The Literature refers to the collection of scholarly writings on a topic. This includes peer-reviewed articles, books, dissertations and conference papers.

  • When reviewing the literature, be sure to include major works as well as studies that respond to major works. You will want to focus on primary sources, though secondary sources can be valuable as well.

Primary Sources

The term primary source is used broadly to embody all sources that are original. P rimary sources provide first-hand information that is closest to the object of study. Primary sources vary by discipline.

  • In the natural and social sciences, original reports of research found in academic journals detailing the methodology used in the research, in-depth descriptions, and discussions of the findings are considered primary sources of information.
  • Other common examples of primary sources include speeches, letters, diaries, autobiographies, interviews, official reports, court records, artifacts, photographs, and drawings.  

Galvan, J. L. (2013). Writing literature reviews: A guide for students of the social and behavioral sciences . Glendale, CA: Pyrczak.

Secondary Sources

A secondary source is a source that provides non-original or secondhand data or information. 

  • Secondary sources are written about primary sources.
  • Research summaries reported in textbooks, magazines, and newspapers are considered secondary sources. They typically provide global descriptions of results with few details on the methodology. Other examples of secondary sources include biographies and critical studies of an author's work.

Secondary Source. (2005). In W. Paul Vogt (Ed.), Dictionary of Statistics & Methodology. (3 rd ed., p. 291). Thousand Oaks, CA: SAGE Publications, Inc.

Weidenborner, S., & Caruso, D. (1997). Writing research papers: A guide to the process . New York: St. Martin's Press.

More Examples of Primary and Secondary Sources

 
Original artwork Article critiquing the piece of art
Diary of an immigrant from Vietnam Book on various writings of Vietnamese immigrants
Poem Article on a particular genre of poetry
Treaty Essay on Native American land rights
Report of an original experiment Review of several studies on the same topic
Video of a performance Biography of a playwright
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  • Primary vs. Secondary Sources | Difference & Examples

Primary vs. Secondary Sources | Difference & Examples

Published on 4 September 2022 by Raimo Streefkerk . Revised on 15 May 2023.

When you do research, you have to gather information and evidence from a variety of sources.

Primary sources provide raw information and first-hand evidence. Examples include interview transcripts, statistical data, and works of art. A primary source gives you direct access to the subject of your research.

Secondary sources provide second-hand information and commentary from other researchers. Examples include journal articles, reviews, and academic books . A secondary source describes, interprets, or synthesises primary sources.

Primary sources are more credible as evidence, but good research uses both primary and secondary sources.

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Table of contents

What is a primary source, what is a secondary source, primary and secondary source examples, how to tell if a source is primary or secondary, primary vs secondary sources: which is better, frequently asked questions about primary and secondary sources.

A primary source is anything that gives you direct evidence about the people, events, or phenomena that you are researching. Primary sources will usually be the main objects of your analysis.

If you are researching the past, you cannot directly access it yourself, so you need primary sources that were produced at the time by participants or witnesses (e.g. letters, photographs, newspapers ).

If you are researching something current, your primary sources can either be qualitative or quantitative data that you collect yourself (e.g. through interviews, surveys, experiments) or sources produced by people directly involved in the topic (e.g. official documents or media texts).

Primary sources
Research field Primary source
History
Art and literature
Communication and social studies
Law and politics
Sciences

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secondary sources vs literature review

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A secondary source is anything that describes, interprets, evaluates, or analyses information from primary sources. Common examples include:

  • Books , articles and documentaries that synthesise information on a topic
  • Synopses and descriptions of artistic works
  • Encyclopaedias and textbooks that summarize information and ideas
  • Reviews and essays that evaluate or interpret something

When you cite a secondary source, it’s usually not to analyse it directly. Instead, you’ll probably test its arguments against new evidence or use its ideas to help formulate your own.

Primary and secondary source examples
Primary source Secondary source
Novel Article analysing the novel
Painting Exhibition catalog explaining the painting
Letters and diaries written by a historical figure Biography of the historical figure
Essay by a philosopher Textbook summarising the philosopher’s ideas
Photographs of a historical event Documentary about the historical event
Government documents about a new policy Newspaper article about the new policy
Music recordings Academic book about the musical style
Results of an opinion poll Blog post interpreting the results of the poll
Empirical study Literature review that cites the study

Examples of sources that can be primary or secondary

A secondary source can become a primary source depending on your research question . If the person, context, or technique that produced the source is the main focus of your research, it becomes a primary source.

To determine if something can be used as a primary or secondary source in your research, there are some simple questions you can ask yourself:

  • Does this source come from someone directly involved in the events I’m studying (primary) or from another researcher (secondary)?
  • Am I interested in analysing the source itself (primary) or only using it for background information (secondary)?
  • Does the source provide original information (primary) or does it comment upon information from other sources (secondary)?

Most research uses both primary and secondary sources. They complement each other to help you build a convincing argument. Primary sources are more credible as evidence, but secondary sources show how your work relates to existing research.

What do you use primary sources for?

Primary sources are the foundation of original research. They allow you to:

  • Make new discoveries
  • Provide credible evidence for your arguments
  • Give authoritative information about your topic

If you don’t use any primary sources, your research may be considered unoriginal or unreliable.

What do you use secondary sources for?

Secondary sources are good for gaining a full overview of your topic and understanding how other researchers have approached it. They often synthesise a large number of primary sources that would be difficult and time-consuming to gather by yourself. They allow you to:

  • Gain background information on the topic
  • Support or contrast your arguments with other researchers’ ideas
  • Gather information from primary sources that you can’t access directly (e.g. private letters or physical documents located elsewhere)

When you conduct a literature review , you can consult secondary sources to gain a thorough overview of your topic. If you want to mention a paper or study that you find cited in a secondary source, seek out the original source and cite it directly.

Remember that all primary and secondary sources must be cited to avoid plagiarism . You can use Scribbr’s free citation generator to do so!

Common examples of primary sources include interview transcripts , photographs, novels, paintings, films, historical documents, and official statistics.

Anything you directly analyze or use as first-hand evidence can be a primary source, including qualitative or quantitative data that you collected yourself.

Common examples of secondary sources include academic books, journal articles , reviews, essays , and textbooks.

Anything that summarizes, evaluates or interprets primary sources can be a secondary source. If a source gives you an overview of background information or presents another researcher’s ideas on your topic, it is probably a secondary source.

To determine if a source is primary or secondary, ask yourself:

  • Was the source created by someone directly involved in the events you’re studying (primary), or by another researcher (secondary)?
  • Does the source provide original information (primary), or does it summarize information from other sources (secondary)?
  • Are you directly analyzing the source itself (primary), or only using it for background information (secondary)?

Some types of sources are nearly always primary: works of art and literature, raw statistical data, official documents and records, and personal communications (e.g. letters, interviews ). If you use one of these in your research, it is probably a primary source.

Primary sources are often considered the most credible in terms of providing evidence for your argument, as they give you direct evidence of what you are researching. However, it’s up to you to ensure the information they provide is reliable and accurate.

Always make sure to properly cite your sources to avoid plagiarism .

A fictional movie is usually a primary source. A documentary can be either primary or secondary depending on the context.

If you are directly analysing some aspect of the movie itself – for example, the cinematography, narrative techniques, or social context – the movie is a primary source.

If you use the movie for background information or analysis about your topic – for example, to learn about a historical event or a scientific discovery – the movie is a secondary source.

Whether it’s primary or secondary, always properly cite the movie in the citation style you are using. Learn how to create an MLA movie citation or an APA movie citation .

Articles in newspapers and magazines can be primary or secondary depending on the focus of your research.

In historical studies, old articles are used as primary sources that give direct evidence about the time period. In social and communication studies, articles are used as primary sources to analyse language and social relations (for example, by conducting content analysis or discourse analysis ).

If you are not analysing the article itself, but only using it for background information or facts about your topic, then the article is a secondary source.

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.

Streefkerk, R. (2023, May 15). Primary vs. Secondary Sources | Difference & Examples. Scribbr. Retrieved 19 August 2024, from https://www.scribbr.co.uk/working-sources/primary-vs-secondary-sources/

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How to Write a Literature Review: Primary and Secondary Sources

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Primary versus Secondary Sources

Primary vs. secondary videos.

Primary, Secondary, & Tertiary Sources The content of research papers may come from different types of sources, such as:

  • Your own opinion and analysis
  • Primary sources
  • Secondary sources
  • Tertiary sources

It may not be necessary to include each of these types of sources in every paper you write, but your instructor may require you to include them. It is important to understand the characteristics of primary, secondary and tertiary sources–they each serve a different purpose throughout the research process, and can strengthen your assignment, too.

It can be difficult to figure out if a source is considered primary, secondary, or tertiary. We will explain the differences and provide examples of each in this tutorial. If you are still not sure if a source you would like to use is primary, secondary, or tertiary, ask a librarian or teacher.

What is a Primary Source? Primary sources are first-hand, authoritative accounts of an event, topic, or historical time period. They are typically produced at the time of the event by a person who experienced it, but can also be made later on in the form of personal memoirs or oral histories.

Anything that contains original information on a topic is considered a primary source. Usually, primary sources are the object discussed in your paper. For instance, if you are writing an analysis on Upton Sinclair’s The Jungle, the book would be a primary source. But, just because a source is old does not mean it is a primary source.

Some examples of original, first-hand, authoritative accounts include:

  • Letters, diaries or journals (Personal thoughts)
  • Original photographs
  • First-hand newspaper reports
  • Speeches, autobiographies
  • Creative works like plays, paintings and songs
  • Research data and surveys

What is a Secondary Source? Secondary sources interpret or critique primary sources. They often include an analysis of the event that was discussed or featured in the primary source.  They are second-hand accounts that interpret or draw conclusions from one or more primary sources.

Some examples of works that interpret or critique primary sources include:

  • Textbooks (May also be considered tertiary)
  • Essays or reviews
  • Articles that analyze or discuss ideas and events
  • Criticisms or commentaries

What is a Tertiary Source? Tertiary sources generally provide an overview or summary of a topic, and may contain both primary and secondary sources. The information is displayed as entirely factual, and does not include analysis or critique.  Tertiary sources can also be collections of primary and secondary sources, such as databases, bibliographies and directories.

Some examples of sources that provide a summary or collection of a topic include:

  • Textbooks (May also be considered secondary)
  • Bibliographies or abstracts
  • Wikipedia articles
  • Encyclopedias

Using Primary, secondary and Tertiary Sources in Research Let’s say you are writing a research paper on the Equal Rights Amendment (ERA) of 1972, but you are unfamiliar with it. A good place to gather a general idea or understanding of the ERA would be a tertiary source, such as Wikipedia or the Encyclopedia Britannica. There, you can read a summary of events on its history, key people involved, and legislation.

To find more in-depth analysis on the Equal Rights Amendment, you consult a secondary source: the nonfiction book Why We Lost the ERA by Jane Mansbridge and a newspaper article from the 1970’s that discuss and review the legislation. These provide a more focused analysis of the Equal Rights Amendment that you can include as sources in your paper (make sure you cite them!).  A primary source that could bolster your research would be a government document detailing the ERA legislation that initially passed in Congress, giving a first-hand account of the legislation that went through the House and Senate in 1972.

This video provides a great overview of primary and secondary sources: [ youtube http://www.youtube.com/watch?v= PgfQC4d3pKc &w=420&h=315]

Source:  http://content.easybib.com/students/research-guide/primary-secondary-tertiary-sources/

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Systematic Reviews

  • Types of Literature Reviews

What Makes a Systematic Review Different from Other Types of Reviews?

  • Planning Your Systematic Review
  • Database Searching
  • Creating the Search
  • Search Filters and Hedges
  • Grey Literature
  • Managing and Appraising Results
  • Further Resources

Reproduced from Grant, M. J. and Booth, A. (2009), A typology of reviews: an analysis of 14 review types and associated methodologies. Health Information & Libraries Journal, 26: 91–108. doi:10.1111/j.1471-1842.2009.00848.x

Aims to demonstrate writer has extensively researched literature and critically evaluated its quality. Goes beyond mere description to include degree of analysis and conceptual innovation. Typically results in hypothesis or mode Seeks to identify most significant items in the field No formal quality assessment. Attempts to evaluate according to contribution Typically narrative, perhaps conceptual or chronological Significant component: seeks to identify conceptual contribution to embody existing or derive new theory
Generic term: published materials that provide examination of recent or current literature. Can cover wide range of subjects at various levels of completeness and comprehensiveness. May include research findings May or may not include comprehensive searching May or may not include quality assessment Typically narrative Analysis may be chronological, conceptual, thematic, etc.
Mapping review/ systematic map Map out and categorize existing literature from which to commission further reviews and/or primary research by identifying gaps in research literature Completeness of searching determined by time/scope constraints No formal quality assessment May be graphical and tabular Characterizes quantity and quality of literature, perhaps by study design and other key features. May identify need for primary or secondary research
Technique that statistically combines the results of quantitative studies to provide a more precise effect of the results Aims for exhaustive, comprehensive searching. May use funnel plot to assess completeness Quality assessment may determine inclusion/ exclusion and/or sensitivity analyses Graphical and tabular with narrative commentary Numerical analysis of measures of effect assuming absence of heterogeneity
Refers to any combination of methods where one significant component is a literature review (usually systematic). Within a review context it refers to a combination of review approaches for example combining quantitative with qualitative research or outcome with process studies Requires either very sensitive search to retrieve all studies or separately conceived quantitative and qualitative strategies Requires either a generic appraisal instrument or separate appraisal processes with corresponding checklists Typically both components will be presented as narrative and in tables. May also employ graphical means of integrating quantitative and qualitative studies Analysis may characterise both literatures and look for correlations between characteristics or use gap analysis to identify aspects absent in one literature but missing in the other
Generic term: summary of the [medical] literature that attempts to survey the literature and describe its characteristics May or may not include comprehensive searching (depends whether systematic overview or not) May or may not include quality assessment (depends whether systematic overview or not) Synthesis depends on whether systematic or not. Typically narrative but may include tabular features Analysis may be chronological, conceptual, thematic, etc.
Method for integrating or comparing the findings from qualitative studies. It looks for ‘themes’ or ‘constructs’ that lie in or across individual qualitative studies May employ selective or purposive sampling Quality assessment typically used to mediate messages not for inclusion/exclusion Qualitative, narrative synthesis Thematic analysis, may include conceptual models
Assessment of what is already known about a policy or practice issue, by using systematic review methods to search and critically appraise existing research Completeness of searching determined by time constraints Time-limited formal quality assessment Typically narrative and tabular Quantities of literature and overall quality/direction of effect of literature
Preliminary assessment of potential size and scope of available research literature. Aims to identify nature and extent of research evidence (usually including ongoing research) Completeness of searching determined by time/scope constraints. May include research in progress No formal quality assessment Typically tabular with some narrative commentary Characterizes quantity and quality of literature, perhaps by study design and other key features. Attempts to specify a viable review
Tend to address more current matters in contrast to other combined retrospective and current approaches. May offer new perspectives Aims for comprehensive searching of current literature No formal quality assessment Typically narrative, may have tabular accompaniment Current state of knowledge and priorities for future investigation and research
Seeks to systematically search for, appraise and synthesis research evidence, often adhering to guidelines on the conduct of a review Aims for exhaustive, comprehensive searching Quality assessment may determine inclusion/exclusion Typically narrative with tabular accompaniment What is known; recommendations for practice. What remains unknown; uncertainty around findings, recommendations for future research
Combines strengths of critical review with a comprehensive search process. Typically addresses broad questions to produce ‘best evidence synthesis’ Aims for exhaustive, comprehensive searching May or may not include quality assessment Minimal narrative, tabular summary of studies What is known; recommendations for practice. Limitations
Attempt to include elements of systematic review process while stopping short of systematic review. Typically conducted as postgraduate student assignment May or may not include comprehensive searching May or may not include quality assessment Typically narrative with tabular accompaniment What is known; uncertainty around findings; limitations of methodology
Specifically refers to review compiling evidence from multiple reviews into one accessible and usable document. Focuses on broad condition or problem for which there are competing interventions and highlights reviews that address these interventions and their results Identification of component reviews, but no search for primary studies Quality assessment of studies within component reviews and/or of reviews themselves Graphical and tabular with narrative commentary What is known; recommendations for practice. What remains unknown; recommendations for future research
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Primary, Secondary, & Tertiary Sources

  • Source Types
  • Primary Sources
  • Secondary Sources
  • Tertiary Sources
  • Examples by Discipline

What are secondary sources?

Secondary sources depend upon primary sources. Secondary sources describe, discuss, interpret, comment upon, analyze, evaluate, summarize, and process primary sources. The important thing to keep in mind when trying to decide if a source is primary or secondary is whether or not the author did the thing they are reporting on. If they did, it is a primary source; if they did not, it is a secondary source.

What is the role of secondary sources in research?

Secondary sources represent the scholarly conversation that has taken place, or is currently taking place, on a given topic. Thus, it is imperative that researchers acquire a comprehensive knowledge of the secondary literature on their topic to be able to then engage with it and offer their own perspective through their writing. Scholars show their deep knowledge of their topic by demonstrating in their writing their awareness of secondary literature. Research that does not include substantial references to both primary and secondary sources is not likely to be authoritative or reliable. For that reason, looking at the listed references in a piece of research can help you determine its value.

What are some examples of secondary sources?

Like primary sources, secondary sources can be lots of different kinds of resources depending on discipline and application. Secondary sources can be:

  • Journal articles
  • Monographs (books written on a single subject)
  • Newspaper or magazine articles
  • Book or movie reviews 

In the sciences, secondary sources tend to be things like literature reviews (synthesized descriptions of previous scholarship on a topic), systematic reviews (overviews of primary sources on a topic), or meta analyses (studies in which conclusions are drawn from consideration of systematic reviews).

In the humanities, secondary sources tend to be journal articles that discuss or evaluate someone else's research, monographs, or reviews. 

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secondary sources vs literature review

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Understanding scientific literature, primary sources, secondary sources, tertiary sources.

  • Identifying a Research Article
  • Scholarly vs. Popular Literature

What are primary sources?

In the sciences primary sources are original research or data. Primary sources can include any of the following publications 

  • Journal Articles -- Journal articles can be primary sources if they contain original research, but keep in mind that not all journal articles are primary sources.
  • Reports -- Reports are publications on research that are published independently of a journal. They are often published by governments or companies.
  • Theses and Dissertations -- Theses and Dissertations are the original research of an academic working on a degree. 
  • Conference Proceedings -- Conference Proceedings are a collection of papers that have been presented at a conference. 
  • Published Data -- Data can be considered a primary source, as it is the product of original research.

Why use primary sources?

  Primary sources are a researchers firsthand account of their research. They provide an in depth view into how the research was conducted, and may contain supplemental materials like questionnaires used. A summary of a study or experiment in a book or review paper may not discuss all the findings, and you can gain more insight into a particular topic or issue by looking at the primary sources. 

How to find primary sources:

Resources for finding primary sources include: 

  • Databases and Indexes -- The exact database or index you choose to search will depend on the discipline you are searching in. 
  • Review Papers -- Review papers are often synthesized from other researchers to give an in-depth understanding of the current state of knowledge on a topic. If you have found a review paper when you are looking for a research paper don't fear! If the review paper is on the write topic it will cite plenty of research papers on your topic of interest. 

What are secondary sources?

In the sciences secondary sources analyze, interpret, summarize, or evaluate the findings of primary sources. Secondary sources can include any of the following publications: 

  • Journal review articles -- A review article summarizes past research on a given topic. Review articles can range from highly intensive systematic or integrative reviews or less rigorous literature reviews.
  • Textbooks -- The information in textbooks in the sciences is the product of past research.  
  • Monographs -- A monograph is a book-length scholarly publication dedicated to a single topic. 

Secondary sources can save you time by providing information on the current state of knowledge on a given topic, and also as a way to find primary resources. If you are interested to know what are important, seminal papers in on a topic look at what papers are cited in a textbook on that topic. Review papers can give you in-depth information on a particular research area. Secondary resources are also often less technical than primary resources. 

How to find secondary sources:

Resources for finding secondary sources 

  • Databases and Indexes -- Databases and indexes are particularly useful for finding review articles.  
  • The Library Catalog or Ram Search -- The library catalog or Ram Search will help you locate books on the topic you are interested in. 

What are tertiary sources?

In the sciences tertiary resources are synthesized from primary and secondary resources. They usually provide summaries on the current state of knowledge. Tertiary sources can include the following publications: 

  • Encyclopedias
  • Dictionaries 
  • Factbooks 
  • Almanacs 

Why use tertiary sources?

Tertiary sources can be viewed as a jumping off point for your own research. They provide succinct  summaries on topics, and can be a good way to familiarize yourself with the terminology on a topic before you begin searching the databases.

How to find tertiary sources:

Resources for finding tertiary sources include: 

  • The Library Catalog or Ram Search -- Keep in mind a majority of our encyclopedias are in the reference room. 
  • LibGuides and the Library Website -- We have a number of digital encyclopedias. Check the LibGuide for your field to see what digital encyclopedias we might offer!
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Conducting a Literature Review: Types of Literature

  • Introduction
  • 1. Choose Your Topic

Types of Literature

  • 3. Search the Literature
  • 4. Read & Analyze the Literature
  • 5. Write the Review
  • Keeping Track of Information
  • Style Guides

Different types of publications have different characteristics.

Primary Literature Primary sources means original studies, based on direct observation, use of statistical records, interviews, or experimental methods, of actual practices or the actual impact of practices or policies. They are authored by researchers, contains original research data, and are usually published in a peer-reviewed journal. Primary literature may also include conference papers, pre-prints, or preliminary reports. Also called empirical research .

Secondary Literature Secondary literature consists of interpretations and evaluations that are derived from or refer to the primary source literature. Examples include review articles (such as meta-analysis and systematic reviews) and reference works. Professionals within each discipline take the primary literature and synthesize, generalize, and integrate new research.

Tertiary Literature Tertiary literature consists of a distillation and collection of primary and secondary sources such as textbooks, encyclopedia articles, and guidebooks or handbooks. The purpose of tertiary literature is to provide an overview of key research findings and an introduction to principles and practices within the discipline.

Adapted from the Information Services Department of the Library of the Health Sciences-Chicago , University of Illinois at Chicago.

Original research results in journals,
dissertations, conference proceedings, correspondence

Review articles, systematic reviews, meta-analysis, practice guidelines, monographs on a specific subject

Textbooks, encyclopedias, handbooks, newspapers

Sources: NEJM, JAMA Sources: PubMed, CINAHL, Cochrane Library, Web of Science, Williams Obstetrics, Hurst's The Heart Sources:  Gale Encyclopedia of Genetic Disorders, Oxford Handbook of Internal Medicine

Types of Scientific Publications

These examples and descriptions of publication types will give you an idea of how to use various works and why you would want to write a particular kind of paper.

  • Scholarly article aka empirical article
  • Review article
  • Conference paper

Scholarly (aka empirical) article -- example

Empirical studies use data derived from observation or experiment. Original research papers (also called primary research articles) that describe empirical studies and their results are published in academic journals.  Articles that report empirical research contain different sections which relate to the steps of the scientific method.

      Abstract - The abstract provides a very brief summary of the research.

     Introduction - The introduction sets the research in a context, which provides a review of related research and develops the hypotheses for the research.

     Method - The method section describes how the research was conducted.

     Results - The results section describes the outcomes of the study.

     Discussion - The discussion section contains the interpretations and implications of the study.

     References - A references section lists the articles, books, and other material cited in the report.

Review article -- example

A review article summarizes a particular field of study and places the recent research in context. It provides an overview and is an excellent introduction to a subject area. The references used in a review article are helpful as they lead to more in-depth research.

Many databases have limits or filters to search for review articles. You can also search by keywords like review article, survey, overview, summary, etc.

Conference proceedings, abstracts and reports -- example

Conference proceedings, abstracts and reports are not usually peer-reviewed.  A conference article is similar to a scholarly article insofar as it is academic. Conference articles are published much more quickly than scholarly articles. You can find conference papers in many of the same places as scholarly articles.

How Do You Identify Empirical Articles?

To identify an article based on empirical research, look for the following characteristics:

     The article is published in a peer-reviewed journal .

     The article includes charts, graphs, or statistical analysis .

     The article is substantial in size , likely to be more than 5 pages long.

     The article contains the following parts (the exact terms may vary): abstract, introduction, method, results, discussion, references .

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How To Do Secondary Research or a Literature Review

What is secondary research, why is secondary research important.

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Secondary research, also known as a literature review , preliminary research , historical research , background research , desk research , or library research , is research that analyzes or describes prior research. Rather than generating and analyzing new data, secondary research analyzes existing research results to establish the boundaries of knowledge on a topic, to identify trends or new practices, to test mathematical models or train machine learning systems, or to verify facts and figures. Secondary research is also used to justify the need for primary research as well as to justify and support other activities. For example, secondary research may be used to support a proposal to modernize a manufacturing plant, to justify the use of newly a developed treatment for cancer, to strengthen a business proposal, or to validate points made in a speech.

Because secondary research is used for so many purposes in so many settings, all professionals will be required to perform it at some point in their careers. For managers and entrepreneurs, regardless of the industry or profession, secondary research is a regular part of worklife, although parts of the research, such as finding the supporting documents, are often delegated to juniors in the organization. For all these reasons, it is essential to learn how to conduct secondary research, even if you are unlikely to ever conduct primary research.

Secondary research is also essential if your main goal is primary research. Research funding is obtained only by using secondary research to show the need for the primary research you want to conduct. In fact, primary research depends on secondary research to prove that it is indeed new and original research and not just a rehash or replication of somebody else’s work.

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Understanding and Evaluating Resources

  • Evaluating Journal Articles
  • Evaluating News Resources
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  • Primary vs. Secondary Sources
  • Different Types of Sources
  • Primary Sources
  • Secondary Sources
  • Tertiary Sources

What is a primary source?

personal data and research

Anthropology, Archeology

Articles describing research, ethnographies, surveys, cultural and historical artifacts

Communications, Journalism

News (printed, radio, TV, online), photographs, blogs, social media sites

Education, Political Science, Public  Policy 

Government publications, laws, court cases, speeches, test results, interviews, polls, surveys

Fine Arts

Original artwork, photographs, recordings of performances and music, scripts (film, theater, television), music scores, interviews, memoirs, diaries, letters

History

Government publications, newspapers, photographs, diaries, letters, manuscripts, business records, court cases, videos, polls, census data, speeches

Language and Literature

Novels, plays, short stories, poems, dictionaries,

 language manuals

Psychology, Sociology, Economics

Articles describing research, experiment results, ethnographies, interviews, surveys, data sets

Sciences

Articles describing research and methodologies, documentation of lab research, research studies

Search Primary Sources @ RWU

What is a secondary source.

analyzing data

Anthropology, Archeology

Reviews of the literature, critical interpretations of scholarly studies

Communications, Journalism

Interpretive journal articles, books, and blogs about the communications industry.

Education, Political Science, Public Policy 

Reviews of the literature, critical interpretations of scholarly studies

Fine Arts

Critical interpretations of art and artists—biographies, reviews, recordings of live performances

History

Interpretive journal articles and books

Language and Literature

Literary criticism, biographies, reviews, text books

Psychology, Sociology, Economics

Reviews of the literature, critical interpretations of scholarly studies

Sciences

Publications about the significance of research or experiments

What is a tertiary source?

three authors into 1 source

  • Encyclopedias, like Wikipedia, Encyclopedia Brittanica, etc.
  • Dictionaries, like Oxford English Dictionary, Etymology Online, etc.
  • Almanacs, like World Almanac, Book of Facts, etc.
  • Factbooks, like CIA World Factbook
  • Chronologies, like Chronicle of the 20th Century
  • Some Textbooks
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Evaluating Resources: Primary & Secondary Sources

Primary v. secondary sources.

A question to ask yourself when trying to identify primary or secondary sources is:

Did the person writing the thing do the thing?

While this may sound odd, the best indicator that something is a primary source is if the author of the piece actually DID the work that led to the creation of the resource.

These are some other things to consider with primary and secondary sources.

  • Primary and secondary sources can be different publication types. Articles can be primary or secondary, just as books can be.
  • Primary and secondary sources are not related to peer review in any way. Peer-reviewed articles can be either primary or secondary sources.
  • There is no perfect database limiter for primary or secondary, either. There are no check boxes like there are with with peer review.
  • Primary and secondary sources don't self identify as such. Nowhere in a primary source will it say, "this is a primary source." You need to evaluate the resource to figure it out.

Primary sources

In primary source documents, the person writing the piece actually did the research, or witnessed the event, or created something entirely new. These are some examples of primary sources:

  • An author completes original research and then writes about it.
  • An author writes about his or her experience of an event.
  • An author creates an original theory or philosophy, and then writes about it.
  • An author writes an original novel.

Secondary sources

Secondary sources evaluate or analyze what others have done or witnessed or created. The authors didn't go out and do it, they just analyzed it or wrote about it. These are some examples of secondary sources:

  • Authors gather together a lot of primary research studies and then analyze them.  
  • An author chooses a topic, finds a lot of articles on that topic, and writes about the topic based on other authors' research.  
  • An author analyzes an original creative work.

Identifying primary & secondary sources

When looking at a resource to determine whether it is primary or secondary, words that describe the action of the author can be helpful. For example,  words like these can indicate actual research carried out:

  • experimented
  • investigated

In secondary resources, since the focus is on analyzing or discussion of a primary source, you would look for words that describe the action of the author indicating that this is an analysis or discussion, such as:

  • reported on

You will need to examine the abstract and/or the article to determine if the resource is primary or secondary. While the words above can help indicate the type of resource, this is not a cut and dried process where if you see a particular word, that means the resource is always primary.

Locating a findings section in an article doesn't mean the source is either primary or secondary. Check to see whether the authors did the research themselves, or whether they analyzed research done by others.

Primary source example

For example, in the article, "School counselors' strategies for social justice change: A grounded theory of what works in the real world," these are some of the key elements from the abstract that indicate that it is a primary, research article:

  • qualitative study
  • grounded theory methodology
  • explore the strategies that 16 school counselors
  • Findings included seven overarching themes

The primary source authors actually talked to 16 school counselors, using grounded methodology, to come up with their findings based on the research that the authors actually did. Here, the authors did the research themselves and then reported on it.

secondary sources vs literature review

Singh, A. A., Urbano, A., Haston, M., & McMahon, E. (2010). School counselors' strategies for social justice change: A grounded theory of what works in the real world. Professional School Counseling , 13 (3), 135-145. https://doi.org/10.5330/PSC.n.2010-13.135

  • Abstract of School counselors' strategies for social justice change: A grounded theory of what works in the real world (PDF)

Secondary source example

This is an example of an article that is a secondary source, with some of the key elements highlighted:

In the article abstract, "Advocacy for health equity: A synthesis review," these are some of the key elements that indicate it is a secondary source article:

  • aim of this review is to synthesize the evidence in the academic and gray literature
  • systematic review of the academic literature and a fixed-length systematic search of the gray literature
  • anaylzed our findings
  • synthesized our findings
  • made a critical appraisal of the literature
  • brings together for the first time evidence from the academic and the gray literature and provides a building block for efforts to advocate for health equity

What makes the secondary source secondary is that the authors used other authors' research, analyzing and synthesizing the information to come up with their conclusions, or findings.

secondary sources vs literature review

Farrer, L., Marinetti, C., Cavaco, Y. K., & Costongs, C. (2015). Advocacy for health equity: A synthesis review. Milbank Quarterly , 93 (2), 392-437. https://doi.org/10.1111/1468-0009.12112

  • Abstract of Advocacy for health equity: A synthesis review (PDF)
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How to evaluate

When evaluating primary or secondary sources, asked questions to help ascertain the nature and value of material being considered:

  • How does the author know these details (names, dates, times)? Was the author present at the event or soon on the scene?
  • Where does this information come from—personal experience, eyewitness accounts, or reports written by others?
  • Are the author's conclusions based on a single piece of evidence, or have many sources been taken into account (e.g., diary entries, along with third-party eyewitness accounts, impressions of contemporaries, newspaper accounts)?

Source materials must be assessed critically; even the most scrupulous and thorough work is viewed through the eyes of the writer/interpreter. This must be taken into account when one is attempting to arrive at the 'truth' of an event.

poem / novel / letter / diary

Interview / oral history/ empirical research article, law / court case / census data / data set / memoir / autobiography / photographs / speeches, primary sources.

Primary sources are created by people or organizations directly involved in an issue or event. Primary sources are information before it has been analyzed by scholars, students, and others.

Some examples of primary sources:

  • diaries and letters
  • academic articles presenting original scientific research
  • news reports from the time of the event
  • literature (poems, novels, plays, etc.)
  • fine art (photographs, paintings, sculpture, pottery, music, etc.)
  • official records from a government, judicial court, or company
  • oral histories
  • autobiographies
  • dissertations:  while they are considered primary resources, they are NOT considered peer-reviewed

critique / anthology / scholarly article

Book / literature review / essay / review, analysis of data / biography / political commentary / analysis, secondary sources.

Secondary sources analyze and interpret issues and events. Secondary sources, such as scholarly articles, are typically written by experts who study a topic but are  not  directly involved in events themselves. Also, secondary sources are usually produced some time after an event occurs and may well contain analysis of primary sources.

Some examples of secondary sources:

  • scholarly articles that  analyze, review, and/or compare  past research
  • news reports or articles looking back at a historical event
  • documentaries
  • biographies
  • encyclopedias
  • textbooks 

TIP : If you are looking at peer-reviewed articles, look at the abstract to verify if is a primary or secondary source! If the title mentions the words:  review , it is likely to be secondary.

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Biology: Primary and Secondary Literature

Primary sources are different in the sciences than other areas of study. The question to ask to determine if a source is primary or secondary in science is, "Did the authors of this paper collect the data?" There are several clues to answer this question. 

Primary source —the work represents original research

Secondary source —the work reflects on, synthesizes, or reviews the research of others. 

Clues that the article is a primary source: 

  • Analyzes the data collected by the authors. 
  • Abstract may include phrases like "we observed," "we collected samples," etc. 
  • Usually includes a methods section. 
  • Will include a review of past work by others, but this is meant to provide context for original data collection and analysis. 

Example of primary source because authors collected the data, as indicated by "this study reports on monthly sampling" in the abstract.

Clues that the article is a secondary source: 

  • Describes the work of other scientists.
  • Title or abstract includes the terms  review ,  literature review , or  meta-analysis . 
  • May not include a methods section. 

The article below is a secondary source, not only because it says "review" in the title, but also because the article mentions it is a survey of other articles. 

Review Article Example

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secondary sources vs literature review

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Primary Sources

Some definitions:

Original materials on which other research is based.

Usually the first formal appearance of results in the print or electronic literature.

Present information in its original form, neither interpreted nor condensed nor evaluated by other writers.

Are from the time period (for example, something written close to when what it is recording happened is likely to be a primary source.)

Present original thinking, report on discoveries, or share new information.

Some examples:

Scientific journal articles reporting experimental research results

Proceedings of Meetings, Conferences and Symposia.

Technical reports

Dissertations or theses ( may also be secondary )

Internet communications on email, listservs, and newsgroups

Secondary Sources

In science, secondary sources are those which simplify the process of finding and evaluating the primary literature. They tend to be works which repackage, reorganize, reinterpret, summarise, index or otherwise "add value" to the new information reported in the primary literature.

Describe, interpret, analyze and evaluate the primary sources.

Comment on and discuss the evidence provided by primary sources.

Are works which are one or more steps removed from the event or information they refer to, being written after the fact with the benefit of hindsight.

Dictionaries and encyclopedias

Handbooks and data compilations

Journal articles, particularly in disciplines other than science ( may also be primary )

Monographs (other than fiction and autobiography)

Newspaper and popular magazine articles ( may also be primary )

Review articles and literature reviews

Primary, Secondary & Tertiary Sources Written by Ward Saylor & Helen Hooper for Information and Research Support, within the Information Services program of the Academic Support Division at James Cook University, July, 2000.   http://cms.jcu.edu.au/libcomp/assist/guides/azguides/JCUPRD_030412

It can be difficult to tell the difference between original research articles and review articles. You can use this chart to help you.

You can also read the article abstract for clues. If you see phrases such as "we tested"  and "in our study, we measured", it will tell you that the article is reporting on original research.

The following chart offers a brief summarization oft the review types featured in this guide along with their perceived strengths and weaknesses. For more, full-fledge explanation, please visit each review's corresponding page within this guide.

Type  
Generic term; published materials that offer an examination of recent/current literature. Can cover wide range of topics at various levels of completeness and comprehensiveness  Brings together what has been accomplished without repetition and identifying gaps or omission all within a summation No set method to ensure completeness or comprehensiveness. Includes high chance of bias
Aims to demonstrate that the writer has extensively researched the literature and critically evaluated it for quality. Goes beyond simple description to include a degree of analysis and synthesis. Typically results in the formation of hypothesis or model Used to look at the entire body of work on a given topic. Can be used to introduce an idea, resolve competing theories, or call for testing on a topic. Its methods do nor require the same degree of systematicity when compared to other review methodologies. No requirement to present the methods of the search, synthesis, and analysis explicitly.  The focus is on the conceptual contribution of the included literature, not on formal quality assessment. Resulting product is a starting point for further evaluation, not an endpoint
Summarizes past empirical or theoretical literature to provide a more comprehensive understanding of a particular phenomenon or healthcare problem; often implemented by nursing research communities 

Commonly includes non-experimental research, such as case studies, observational studies, and meta-analyses, but may also include practice applications, theory, and guidelines. Can help inform healthcare policy and practice

Combining different types of studies can lead to a lack of thoroughness and an increase in bias. No set method for conducting analysis and synthesis 
Map and categorize existing literature from which to commission further reviews and/or primary research by identifying gaps in the literature Enables contextualization of in-depth systematic review process within broader literature and identification of evidence gaps.  Can help determine what is needed to make an informed decision on a topic, or if a subset can be reviewed due to theoretical perspective, population group, or setting of the study

Time constrained, do not usually included quality assessment, and lack synthesis and analysis of more considered approaches. Studies can be characterized at a broad level which may oversimplify the picture regarding studies and their findings

Technique that statistically combines the results of quantitative studies to provide a more precise effect of the results Utilizes small or inconclusive studies into other studies to aid in forming conclusions that the user would otherwise be unable to do Cannot be better than its included studies allow. Some have argued that the combination of studies is comparing apples and oranges 
Specifically refers to the a review compiling evidence from multiple viewpoints into one document. Focuses on broad condition or problem for which there are competing interventions. Highlights reviews that address these interventions and their results Compiles the evidence of multiple reviews to answer a specific question. Creates a balance between macro-scale reviews and reviews that adopt a micro-focus to examine a specific topic thus becoming hyper-specific Is dependent upon there already being a narrower sub-section of reviews on the topic
Assessment of what is already known about a policy of practice issue. Uses systematic review methods to search and critically appraise existing research Designed to be completed quickly by using less systematic search strategies, looking at other reviews but not grey literature Shortened time frame leads to  limited quality assessment which increases the risk of including biased or low quality research
Preliminary assessment of potential size and scope of available research literature. Seeks to identify nature and extent of research evidence Are used to determine if a full systematic review will be necessary to form a conclusion

Possesses a higher risk of being biased

Seeks to systematically search for, appraise, and synthesis research evidence, typically adhering to strict guidelines on the conduct of a review Comprehensive, seeks to include all knowledge, including grey literature, on a given topic Time-intensive and lengthy process. Strict inclusion/exclusion criteria that can be restrictive and/or hinder wide scale application of methodology when providing conclusions
Review features components of the systematic review process while stopping short of systematic review. Typically conducted for postgraduate work (thesis/dissertation/capstone) Models the systematic review process and allows the author to demonstrate an awareness of the systematic review process and technical proficiency in the component steps. May form the basis for a more extensive work The quality assessment and the synthesis are usually less defined, this can lead to bias. Such reviews do possess a greater likelihood of bias than those that adhere more strictly to guidelines on the conduct of systematic reviews 

Grant, Maria J., and Andrew Booth. “A Typology of Reviews: An Analysis of 14 Review Types and Associated Methodologies.” Health Information & Libraries Journal, vol. 26, no. 2, June 2009, pp. 91–108. Wiley Online Library, doi:10.1111/j.1471-1842.2009.00848.x.

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In the social sciences, a secondary source is usually a scholar book, journal article, or digital or print document that was created by someone who did not directly experience or participate in the events or conditions under investigation. Secondary sources are not evidence per se, but rather, provide an interpretation, analysis, or commentary derived from the content of primary source materials and/or other secondary sources.

Value of Secondary Sources

To do research, you must cite research. Primary sources do not represent research per se, but only the artifacts from which most research is derived. Therefore, the majority of sources in a literature review are secondary sources that present research findings, analysis, and the evaluation of other researcher's works.

Reviewing secondary source material can be of valu e in improving your overall research paper because secondary sources facilitate the communication of what is known about a topic. This literature also helps you understand the level of uncertainty about what is currently known and what additional information is needed from further research. It is important to note, however, that secondary sources are not the subject of your analysis. Instead, they represent various opinions, interpretations, and arguments about the research problem you are investigating--opinions, interpretations, and arguments with which you may either agree or disagree with as part of your own analysis of the literature.

Examples of secondary sources you could review as part of your overall study include:     * Bibliographies [also considered tertiary]     * Biographical works     * Books, other than fiction and autobiography     * Commentaries, criticisms     * Dictionaries, Encyclopedias [also considered tertiary]     * Histories     * Journal articles [depending on the discipline, they can be primary]     * Magazine and newspaper articles [this distinction varies by discipline]     * Textbooks [also considered tertiary]     * Web site [also considered primary]

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  • What is Secondary Research? | Definition, Types, & Examples

What is Secondary Research? | Definition, Types, & Examples

Published on January 20, 2023 by Tegan George . Revised on January 12, 2024.

Secondary research is a research method that uses data that was collected by someone else. In other words, whenever you conduct research using data that already exists, you are conducting secondary research. On the other hand, any type of research that you undertake yourself is called primary research .

Secondary research can be qualitative or quantitative in nature. It often uses data gathered from published peer-reviewed papers, meta-analyses, or government or private sector databases and datasets.

Table of contents

When to use secondary research, types of secondary research, examples of secondary research, advantages and disadvantages of secondary research, other interesting articles, frequently asked questions.

Secondary research is a very common research method, used in lieu of collecting your own primary data. It is often used in research designs or as a way to start your research process if you plan to conduct primary research later on.

Since it is often inexpensive or free to access, secondary research is a low-stakes way to determine if further primary research is needed, as gaps in secondary research are a strong indication that primary research is necessary. For this reason, while secondary research can theoretically be exploratory or explanatory in nature, it is usually explanatory: aiming to explain the causes and consequences of a well-defined problem.

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Secondary research can take many forms, but the most common types are:

Statistical analysis

Literature reviews, case studies, content analysis.

There is ample data available online from a variety of sources, often in the form of datasets. These datasets are often open-source or downloadable at a low cost, and are ideal for conducting statistical analyses such as hypothesis testing or regression analysis .

Credible sources for existing data include:

  • The government
  • Government agencies
  • Non-governmental organizations
  • Educational institutions
  • Businesses or consultancies
  • Libraries or archives
  • Newspapers, academic journals, or magazines

A literature review is a survey of preexisting scholarly sources on your topic. It provides an overview of current knowledge, allowing you to identify relevant themes, debates, and gaps in the research you analyze. You can later apply these to your own work, or use them as a jumping-off point to conduct primary research of your own.

Structured much like a regular academic paper (with a clear introduction, body, and conclusion), a literature review is a great way to evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.

A case study is a detailed study of a specific subject. It is usually qualitative in nature and can focus on  a person, group, place, event, organization, or phenomenon. A case study is a great way to utilize existing research to gain concrete, contextual, and in-depth knowledge about your real-world subject.

You can choose to focus on just one complex case, exploring a single subject in great detail, or examine multiple cases if you’d prefer to compare different aspects of your topic. Preexisting interviews , observational studies , or other sources of primary data make for great case studies.

Content analysis is a research method that studies patterns in recorded communication by utilizing existing texts. It can be either quantitative or qualitative in nature, depending on whether you choose to analyze countable or measurable patterns, or more interpretive ones. Content analysis is popular in communication studies, but it is also widely used in historical analysis, anthropology, and psychology to make more semantic qualitative inferences.

Primary Research and Secondary Research

Secondary research is a broad research approach that can be pursued any way you’d like. Here are a few examples of different ways you can use secondary research to explore your research topic .

Secondary research is a very common research approach, but has distinct advantages and disadvantages.

Advantages of secondary research

Advantages include:

  • Secondary data is very easy to source and readily available .
  • It is also often free or accessible through your educational institution’s library or network, making it much cheaper to conduct than primary research .
  • As you are relying on research that already exists, conducting secondary research is much less time consuming than primary research. Since your timeline is so much shorter, your research can be ready to publish sooner.
  • Using data from others allows you to show reproducibility and replicability , bolstering prior research and situating your own work within your field.

Disadvantages of secondary research

Disadvantages include:

  • Ease of access does not signify credibility . It’s important to be aware that secondary research is not always reliable , and can often be out of date. It’s critical to analyze any data you’re thinking of using prior to getting started, using a method like the CRAAP test .
  • Secondary research often relies on primary research already conducted. If this original research is biased in any way, those research biases could creep into the secondary results.

Many researchers using the same secondary research to form similar conclusions can also take away from the uniqueness and reliability of your research. Many datasets become “kitchen-sink” models, where too many variables are added in an attempt to draw increasingly niche conclusions from overused data . Data cleansing may be necessary to test the quality of the research.

Prevent plagiarism. Run a free check.

If you want to know more about statistics , methodology , or research bias , make sure to check out some of our other articles with explanations and examples.

  • Normal distribution
  • Degrees of freedom
  • Null hypothesis
  • Discourse analysis
  • Control groups
  • Mixed methods research
  • Non-probability sampling
  • Quantitative research
  • Inclusion and exclusion criteria

Research bias

  • Rosenthal effect
  • Implicit bias
  • Cognitive bias
  • Selection bias
  • Negativity bias
  • Status quo bias

A systematic review is secondary research because it uses existing research. You don’t collect new data yourself.

The research methods you use depend on the type of data you need to answer your research question .

  • If you want to measure something or test a hypothesis , use quantitative methods . If you want to explore ideas, thoughts and meanings, use qualitative methods .
  • If you want to analyze a large amount of readily-available data, use secondary data. If you want data specific to your purposes with control over how it is generated, collect primary data.
  • If you want to establish cause-and-effect relationships between variables , use experimental methods. If you want to understand the characteristics of a research subject, use descriptive methods.

Quantitative research deals with numbers and statistics, while qualitative research deals with words and meanings.

Quantitative methods allow you to systematically measure variables and test hypotheses . Qualitative methods allow you to explore concepts and experiences in more detail.

Sources in this article

We strongly encourage students to use sources in their work. You can cite our article (APA Style) or take a deep dive into the articles below.

George, T. (2024, January 12). What is Secondary Research? | Definition, Types, & Examples. Scribbr. Retrieved August 19, 2024, from https://www.scribbr.com/methodology/secondary-research/
Largan, C., & Morris, T. M. (2019). Qualitative Secondary Research: A Step-By-Step Guide (1st ed.). SAGE Publications Ltd.
Peloquin, D., DiMaio, M., Bierer, B., & Barnes, M. (2020). Disruptive and avoidable: GDPR challenges to secondary research uses of data. European Journal of Human Genetics , 28 (6), 697–705. https://doi.org/10.1038/s41431-020-0596-x

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Peer-Reviewed Literature: Peer-Reviewed Research: Primary vs. Secondary

  • Peer-Reviewed Research: Primary vs. Secondary
  • Types of Peer Review
  • Identifying Peer-Reviewed Research

Peer Reviewed Research

Published literature can be either peer-reviewed or non-peer-reviewed. Official research reports are almost always peer reviewed while a journal's other content is usually not. In the health sciences, official research can be primary, secondary, or even tertiary. It can be an original experiment or investigation (primary), an analysis or evaluation of primary research (secondary), or findings that compile secondary research (tertiary). If you are doing research yourself, then primary or secondary sources can reveal more in-depth information.

Primary Research

Primary research is information presented in its original form without interpretation by other researchers. While it may acknowledge previous studies or sources, it always presents original thinking, reports on discoveries, or new information about a topic.

Health sciences research that is primary includes both experimental trials and observational studies where subjects may be tested for outcomes or investigated to gain relevant insight.  Randomized Controlled Trials are the most prominent experimental design because randomized subjects offer the most compelling evidence for the effectiveness of an intervention. See the below graphic and below powerpoint for further information on primary research studies.

secondary sources vs literature review

  • Research Design

Secondary Research

Secondary research is an account of original events or facts. It is secondary to and retrospective of the actual findings from an experiment or trial. These studies may be appraised summaries, reviews, or interpretations of primary sources and often exclude the original researcher(s). In the health sciences, meta-analysis and systematic reviews are the most frequent types of secondary research. 

  • A meta-analysis is a quantitative method of combining the results of primary research. In analyzing the relevant data and statistical findings from experimental trials or observational studies, it can more accurately calculate effective resolutions regarding certain health topics.
  • A systematic review is a summary of research that addresses a focused clinical question in a systematic, reproducible manner. In order to provide the single best estimate of effect in clinical decision making, primary research studies are pooled together and then filtered through an inclusion/exclusion process. The relevant data and findings are then compiled and synthesized to arrive at a more accurate conclusion about a specific health topic. Only peer-reviewed publications are used and analyzed in a methodology which may or may not include a meta-analysis.

secondary sources vs literature review

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Identifying Information Sources

What's the difference, primary sources and research, secondary sources and research, tertiary sources, comparison chart.

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Need to Ask a Question?

Telling the difference between primary, secondary, and tertiary sources can often be confusing because the difference is more about the content of the source than the published format. The format may be a first indicator of whether or not a source is primary, but evaluating the content will be the ultimate judgement call.

Primary and secondary sources often differ based on the academic discipline.

This page will give you some guidance on deciding whether a source can be considered primary or not. Many of the formats listed on this guide will exist in both physical and digital modes.

To start, the following video from the Australian National University Library gives an excellent explanation of the different contexts in which sources can be considered primary, secondary, or tertiary.

Primary sources   are the original documents of an event or discovery.  Primary sources are also records of events as they are first described. They are often considered the most credible sources of evidence and are complimented by secondary which will analyze and give context to primary sources.

Some examples of primary sources are:

  • diaries and letters
  • academic articles reporting NEW data and findings - these are often peer reviewed and called empirical research
  • works of literature (poems, novels, etc.)
  • works of fine art (paintings, sculpture, pottery, etc.)
  • works of performance art (music, fictional films, plays, musicals, operas, etc.
  • official records from a government, judicial court, or company
  • oral histories
  • autobiographies
  • eyewitness new reports*

*Newspaper articles that report on a recent event can be primary sources, but articles that rehash previous events are not primary sources, unless they add new information to the story.

Where do I find primary sources?

It depends on your discipline, but here are are some places to start.

  • Academic journals are the main place that most researchers will initially publish the results of their research and/or experiments, though some disciplines will favor book length publications.
  • Creative works like novels, films, music, and other works of art can often be found through the library catalog or special databases from that discipline.
  • Historical sources like newspapers, diaries, letters, oral histories, and more can be found through archival collections, like the Genesee Historical Collections Center and the many online archival databases we subscribe to.
  • The library's homepage search box or subject specific database are great places to start searching!
  • Library Homepage
  • Thompson Library Research Guides All of the library's research and course guides. Find databases and resources on specific disciplines.

Secondary sources   offer an analysis or a restatement of an event or discovery described in primary sources. They interpret, explain, critique, or otherwise analyze primary sources. Some secondary sources are used to persuade the reader and may be considered less objective. 

Examples of secondary sources include:

  • criticism of a work of art, music, or fiction
  • publications that discuss or analyze a topic
  • articles and editorials that interpret or review research works or other primary sources*
  • some nonfiction books written for general public for entertainment purposes rather than scholarship
  • some textbooks

*Many academic articles include short literature reviews to establish a starting place or a jumping off point for their own, original research; these are still considered primary sources. However, articles that only review or analyze previously published articles  and contain no new research are secondary sources; these articles are called systematic literature reviews and can be good sources of information about the state of research on a certain topic.

Where do I find secondary sources?

  • Academic journals will often publish review articles or publications that critically analyze .
  • News sources that offer editorials

Tertiary sources offer a summary or restatement of facts and research from both primary and secondary sources. The main difference between secondary and tertiary sources is that tertiary sources offer no new information and no analysis of the information from primary and secondary sources.

Tertiary sources are often great places to collect background information and to help locate primary and secondary research.

Examples of tertiary sources include:

  • dictionaries
  • encyclopedias
  • bibliographies

Where do I find tertiary sources?

The following databases contain reference sources like encyclopedia, dictionaries, and handbooks.

U-M login required

Authoritative coverage of thousands of topics in all areas of study.

Encyclopaedia Britannica's latest article database (including hundreds of articles not found in the print edition), Merriam-Webster's Collegiate Dictionary and Thesaurus, and the Britannica Book of the Year (1994-present), with thousands of web links selected by editors. Updated daily.

Recent editions of many major reference books.

Over 400 dictionary, language reference, and subject reference works published by Oxford University Press

Fully indexed, cross-searchable database of over 400 dictionary, language reference, and subject reference works published by Oxford University Press. Includes subject reference works in the humanities, social sciences, and science--both "Quick Reference" titles (concise dictionaries, etc.) and larger "Reference Library" titles (multi-volume encyclopedias, etc.).

A searchable collection of over 150 scholarly encyclopedias, handbooks, and reference books in the social sciences.

Covers anthropology, communication, education, geography, health, history, law, management, politics, psychology, and sociology.

Concise introductions to a diverse range of subject areas in the sciences, social sciences, and arts and humanities.

 

, , , and .

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Library Resources for ELL Students

  • Types of Sources
  • Books & eBooks
  • Articles & Journals
  • Newspapers & Magazines
  • Applying BEAM/BEAT
  • Managing Your Citations

Resource Types

You may have heard of various sources described as primary or secondary. These are categories that help scholars determine the use case for different types of materials that they might cite in their papers and projects. 

Primary Sources

Records of events or evidence as they are first described or actually happened without any interpretation or commentary. Information that is shown for the first time or original materials on which other research is based. Display original thinking, report new discoveries, or share fresh information.

Examples include: 

  • Diaries, letters, & personal narratives
  • Theses & dissertations
  • Original artwork
  • Interviews 
  • Original research reported in scholarly articles

Secondary Sources

Offer an analysis, interpretation, or restatement of primary sources and present an argument or perspective. Often presents synthesis, interpretation, commentary, or evaluation to further the creator's argument or perspective. Intended to describe or explain primary sources.

Examples include:

  • Edited works
  • Books and articles that interpret or review research works
  • Literary criticism & interpretation
  • Biographies

Source Type in Context

Whether a source is primary or secondary depends on how you use it and the topic of your paper! If you’re not sure, ask a librarian for help!

Sources @ BU

Most BU writing program courses will use BEAM/BEAT to help you understand the context of your sources. You will find that Exhibit sources are often primary while Argument and Methodology/Theory sources are often secondary. Check out the Applying BEAM/BEAT page for more information!

Adapted from University of Minnesota Crookston Library (n.d.). Primary, secondary, and tertiary Sources . https://crk.umn.edu/library/

primary-secondary-and-tertiary-sources

Scholarly or Popular?

Types of resources
Characteristics Popular Resources Scholarly Resources Community Resources
Audience general public scholars in the field within the community or the public

Author

member of the public, a journalist, or an author someone with academic expertise in the field a member of the community of interest
Published immediately or following editing following extensive research, editing, and peer review wide range of formats

Scholarly Resources

Scholarly books & journal articles.

Written by people with academic expertise in the field. Use these to understand current and past research on your topic. Academic books are more broadly focused than articles. Use books to understand background information and the context of your topic. Articles will be narrowly focused and include jargon. Be sure to check the bibliography for other scholarly sources.

Dissertations & Theses

Written by graduating PhD and Masters students, these represent a deep exploration of a niche topic. Contains an extensive works cited section.

Literature & Systematic Reviews 

Review of scholarship on a topic, including information gaps and opportunities for further research.

Popular Resources

News, media, & general trade books.

Created by journalists and authors, these resources go through an editing process. Use these to understand the wider framing of conversations around your topic at a given point in time.

Social Media, Streaming, & Other Online Conversations

Unmediated online sources can help you understand conversations around your topic in the public sphere. This is a way to find direct information from opinions to contemporaneous reactions involving your topic.

Community Resources

Self-published materials.

Examples include: Grassroots Archives, Indigenous Knowledge, Oral Histories, Nonprofit Advocacy Groups, Zines

Types of knowledge outside academia are often devalued or excluded from research and scholarship. Look for community voices on your topic by thinking outside the box of traditional scholarship.  

Look for voices inside of impacted communities. This could include social media posts or zines written by and for a particular group of people.

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  6. Primary Vs. Secondary Literature

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COMMENTS

  1. Primary vs. Secondary Sources

    Primary sources provide raw information and first-hand evidence. Examples include interview transcripts, statistical data, and works of art. Primary research gives you direct access to the subject of your research. Secondary sources provide second-hand information and commentary from other researchers. Examples include journal articles, reviews ...

  2. Primary and secondary sources

    The simplest definition of primary sources is either original information (such as survey data) or a first person account of an event (such as an interview transcript). Whereas secondary sources are any publshed or unpublished works that describe, summarise, analyse, evaluate, interpret or review primary source materials.

  3. Primary, Secondary and Tertiary Sources

    Scholarly, professional literature falls under 3 categories, primary, secondary, and tertiary. Published works (also known as a publication) may fall into one or more of these categories, depending on the discipline. See definitions and linked examples of primary, secondary, and tertiary sources. Differences in Publishing Norms by Broader ...

  4. Primary & Secondary Sources

    The term primary source is used broadly to embody all sources that are original. Primary sources provide first-hand information that is closest to the object of study. Primary sources vary by discipline. In the natural and social sciences, original reports of research found in academic journals detailing the methodology used in the research, in ...

  5. Primary vs. Secondary Sources

    A primary source gives you direct access to the subject of your research. Secondary sources provide second-hand information and commentary from other researchers. Examples include journal articles, reviews, and academic books. A secondary source describes, interprets, or synthesises primary sources. Primary sources are more credible as evidence ...

  6. Primary and Secondary Sources

    Primary sources are first-hand, authoritative accounts of an event, topic, or historical time period. They are typically produced at the time of the event by a person who experienced it, but can also be made later on in the form of personal memoirs or oral histories. Anything that contains original information on a topic is considered a primary ...

  7. Types of Literature Reviews

    Characterizes quantity and quality of literature, perhaps by study design and other key features. May identify need for primary or secondary research: Meta-analysis: Technique that statistically combines the results of quantitative studies to provide a more precise effect of the results: Aims for exhaustive, comprehensive searching.

  8. Primary, Secondary, & Tertiary Sources

    Book or movie reviews ; In the sciences, secondary sources tend to be things like literature reviews (synthesized descriptions of previous scholarship on a topic), systematic reviews (overviews of primary sources on a topic), or meta analyses (studies in which conclusions are drawn from consideration of systematic reviews).

  9. Primary, Secondary, and Tertiary Sources

    Review articles can range from highly intensive systematic or integrative reviews or less rigorous literature reviews. Textbooks -- The information in textbooks in the sciences is the product of past research. Monographs -- A monograph is a book-length scholarly publication dedicated to a single topic. Secondary sources can save you time by ...

  10. UB LibGuides: Conducting a Literature Review: Types of Literature

    Tertiary Literature. Tertiary literature consists of a distillation and collection of primary and secondary sources such as textbooks, encyclopedia articles, and guidebooks or handbooks. The purpose of tertiary literature is to provide an overview of key research findings and an introduction to principles and practices within the discipline.

  11. How To Do Secondary Research or a Literature Review

    Secondary research, also known as a literature review, preliminary research, historical research, background research, desk research, or library research, is research that analyzes or describes prior research.Rather than generating and analyzing new data, secondary research analyzes existing research results to establish the boundaries of knowledge on a topic, to identify trends or new ...

  12. Primary vs. Secondary Sources

    The most common secondary resources are books, journal articles, or literature reviews. Secondary sources may also be primary sources. For example, if someone studies the nature of literary criticism in the 19th century then a literary critique from the 19th century becomes a primary resource.

  13. Evaluating Resources: Primary & Secondary Sources

    Primary and secondary sources can be different publication types. Articles can be primary or secondary, just as books can be. Primary and secondary sources are not related to peer review in any way. Peer-reviewed articles can be either primary or secondary sources. There is no perfect database limiter for primary or secondary, either.

  14. Primary Vs. Secondary

    Also, secondary sources are usually produced some time after an event occurs and may well contain analysis of primary sources. Some examples of secondary sources: scholarly articles that analyze, review, and/or compare past research; news reports or articles looking back at a historical event; documentaries; biographies; encyclopedias; textbooks

  15. Library Guides: Biology: Primary and Secondary Literature

    Will include a review of past work by others, but this is meant to provide context for original data collection and analysis. Clues that the article is a secondary source: Describes the work of other scientists. Title or abstract includes the terms review, literature review, or meta-analysis. May not include a methods section.

  16. Primary vs Secondary Sources

    Secondary Sources. In science, secondary sources are those which simplify the process of finding and evaluating the primary literature. They tend to be works which repackage, reorganize, reinterpret, summarise, index or otherwise "add value" to the new information reported in the primary literature. ... Literature Review: Generic term ...

  17. Primary vs Secondary Sources

    Secondary sources are best identified by their use of primary articles as source material.Examples of secondary sources include: review articles, systematic reviews, and meta-analyses.Other sources, such as practice guidelines and expert topic summaries are usually considered secondary as well (although some would argue that they are tertiary since they reference both primary and secondary ...

  18. Secondary Sources

    Therefore, the majority of sources in a literature review are secondary sources that present research findings, analysis, and the evaluation of other researcher's works. Reviewing secondary source material can be of valu e in improving your overall research paper because secondary sources facilitate the communication of what is known about a topic.

  19. What is Secondary Research?

    Tip: Primary vs. secondary sources It can be easy to get confused about the difference between primary and secondary sources in your research. ... Example: Literature review You are interested in the reactions of campus police to student protest movements on campus. You decide to conduct a literature review of scholarly works about student ...

  20. Peer-Reviewed Literature: Peer-Reviewed Research: Primary vs. Secondary

    It is secondary to and retrospective of the actual findings from an experiment or trial. These studies may be appraised summaries, reviews, or interpretations of primary sources and often exclude the original researcher(s). In the health sciences, meta-analysis and systematic reviews are the most frequent types of secondary research.

  21. Primary, Secondary, & Tertiary Sources

    *Many academic articles include short literature reviews to establish a starting place or a jumping off point for their own, original research; these are still considered primary sources. However, articles that only review or analyze previously published articles and contain no new research are secondary sources; these articles are called ...

  22. What's a Primary Source? or a Literature Search?

    Primary literature may also include conference papers, pre-prints, or preliminary reports. Secondary Literature/Source Secondary literature consists of interpretations and evaluations that are derived from or refer to the primary source literature. Examples include review articles (e.g., meta-analysis and systematic reviews) and reference works.

  23. Research: Library Resources for ELL Students: Types of Sources

    Secondary Sources. Offer an analysis, interpretation, or restatement of primary sources and present an argument or perspective. Often presents synthesis, interpretation, commentary, or evaluation to further the creator's argument or perspective. ... Literature & Systematic Reviews . Review of scholarship on a topic, including information gaps ...

  24. Difference between Literature Review and Secondary Research

    The literature review is the detailed summary of previous study that was conducted on a given topic whereas secondary research is the use of already existing data as a method or inquiry. In literature reviews, we can use both primary and secondary sources in the summary whereas, in the secondary research, we conduct a review of secondary ...