A tertiary source consolidates and organizes primary and secondary sources together into one source in order to facilitate quick access to information. Tertiary sources are good starting points for research projects because they often extract the essential meaning or most important aspects of large amounts of information into a convenient format.
The distinctions between primary, secondary, and tertiary sources are frequently ambiguous depending upon the context in which an item is used. Some writers don't make the distinction between tertiary and secondary because both types of materials do not represent original works [primary sources]. However, for the purposes of reviewing the literature, it is important to understand how tiertiary sources can contribute to your overall search for relevant information about the research problem.
Reviewing tertiary source material can be of value in improving your overall research paper because they:
Examples of tiertiary sources you could review as part of your overall study include:
* Abstracts
* Almanacs
* Bibliographies [also considered secondary]
* Chronologies
* Dictionaries and encyclopedias [also considered secondary]
* Directories
* Fact books
* Handbooks
* Indexes, databases, search engines, and bibliographies used to locate primary and secondary sources
* Manuals
* Statistical compendiums
* Textbooks and course readers [may also be secondary]
Tertiary sources also include any type of user-contributed online resource such as Wikipedia.
Subject |
Primary Source |
Secondary Source |
Tertiary Source |
Business |
NASDAQ stock quotes |
Trade journal article on NASDAQ stock trends |
ABI/Inform database |
Communications |
Transcript of television news program |
Newspaper article about person interviewed on the news |
Guide to television news programs |
Economics |
Bureau of the Census population datasets |
Working paper on demographics in California and small business growth |
Statistical Abstract of California |
Education |
Focus group interview of teachers |
Journal article about teaching methods |
Handbook of effective teaching methods |
Environmental Studies |
Fieldwork data measuring glacial melting |
Book on the impact of climate change |
World atlas |
Geography |
Archival maps of Los Angeles |
Website of digitized maps |
Finding aid of maps held at the Los Angeles Public Library |
International Relations |
Diplomatic cables between the United States and Japan |
Journal article examining foreign relations between the U.S. and Japan |
Columbia International Affairs Online database |
Law |
Testimony before Congress |
Television news report on Congressional hearing |
Congressional committee website |
Political Science |
Public Papers of the Presidents of the United States |
Biography of a president |
Encyclopedia about American presidents |
Psychology |
Clinical notes |
Journal article about the psychological condition |
Mental Measurements Yearbook |
Social Work |
Fieldwork observation of prison conditions |
Research report on prison conditions |
Directory of prison facilities |
Sociology |
Survey of adolescent addiction to alcohol |
Journal article about alcoholism among young adults |
Textbook on addictions |