Citing the material depends on the citation format that your professor asked you to use. Copies of books of the more common citation formats (APA, MLA, Turabian, and Chicago) are available for use in the library. The books have an index located in the back where you can look up the specific type of material you need to site. In addition below are some suggested websites to help you with citations.
Citing Primary Sources from the Library of Congress
How to Cite Primary Sources from the Gelman Library (GWU) LibGuide Citation Style Guides