A tertiary source consolidates and organizes primary and secondary source materials 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 can be rather ambiguous depending upon the context in which an item is used. Some writers don't make a distinction between tertiary and secondary because both types of materials do not represent original works [i.e., primary sources]. However, for the purposes of reviewing the literature, it is important to understand how tertiary sources can contribute to the overall process of locating relevant information about a research topic.
Reviewing tertiary source materials can be of value in improving your overall research paper because they:
Examples of tertiary 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]
Note that 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 about NASDAQ stock trends |
ABI/Inform database |
Communications |
Transcript of television news program |
Newspaper article about person interviewed on television |
Guide to television news programs |
Criminal Justice |
Data gathered on prison conditions |
Research report on prison conditions |
Directory of prison facilities |
Economics |
U.S. Bureau of the Census population datasets |
Working paper about demographic changes in California |
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 in the 1960s |
Website of digitized maps |
Finding aid of city maps held at the Los Angeles Public Library |
International Relations |
De-classified diplomatic cables between the United States and Japan |
Journal article examining foreign relations between the U.S. and Japan |
A specialized encyclopedia about the history of Japanese foreign affairs |
Law |
Testimony in a hearing before Congress |
Television news report on the 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 of patient treatment goals and plans |
Journal article about a psychological condition |
Mental Measurements Yearbook |
Public Administration | Meeting minutes of the Housing Authority of the City of Los Angeles | Journal article on the housing crisis in Los Angeles county | Statistical compendium of housing prices |
Social Work |
Counts of homeless people in Los Angeles |
Report on access to shelter for the homeless |
Directory of organizations devoted to helping the homeless |
Sociology |
Interviews of anti-war protesters |
Journal article about anti-war activism among young adults |
Textbook on social movement theories |
Urban and Regional Planning | Zoning plan for the city of Santa Monica | Research report on urban planning in Los Angeles | Directory of new businesses |