Primary Source: An authoritative document relating to a subject, which is used in the preparation of a later work, such as an original record or a contemporary document. In the humanities, a primary source is the document being analyzed; in the sciences it is a journal article reporting the results of original research. Primary sources are also called original sources or source material.
Secondary Source: A publication that digests, analyzes, evaluates, and/or interprets the information in primary sources.
Tertiary Source: A source that compiles, analyzes, and/or digests secondary sources.
More information: Primary vs. Secondary vs. Tertiary
Examples of types of sources.
Academic books and articles should have primary sources as their foundation. Look at their footnotes and bibliographies for contemporary accounts of events, published works from the time of the event, and other primary sources. Use the citation to locate the material within the library’s resources or to request via interlibrary loan.
Some primary sources are published and cataloged just like books. Use the library’s catalog or the OhioLINK catalog. Some ways to help find those are:
Newspapers
The New York Times contains every article, fully searchable, published in the New York Times since 1851. First, set up an account (instructions here). Then just connect to nytimes.com and login. Or, once you have your account set up, download the NYTimes app from the app store. For more information on setting up an account and using the iPad app, see the New York Times Subject Guide.
http://www.nytimes.com/
Other Primary Source Databases