To site a primary source found online, you must know the following*:
- Author or creator of the source
- Title of the source
- Format of the source- is it a pamphlet, government publication, image
- Date the source was originally published
- Site/Resource where you located the primary document
- Name of the collection where you found the source
- Medium (if known)
- Date Accessed
For example, a resource found on the Avalon Project from Yale University would have the following Bibliographic citation format:
Mathius, T.R. The Grounds of an Opinion on the Policy of Restricting the Importation of Foreign Corn: intended as an Appendix to "Observations on the Corn Law. London: John Murray, Albermarle Street, and J. Johnson and Co.,1815. From The Avalon Project, Yale Law School. 19th Century Documents, 1800-1899. http://avalon.law.yale.edu/subject_menus/19th.asp. (accessed October 10, 2016).
**These guidelines are available from the Library of Congress website on citing primary sources.