(I'm grateful to Terri Huston for providing me with explanations and examples on which the following are based.)
Ramsey, Alice (2000, Fall). Locke's views on mathematical truth. Unpublished manuscript, Carnegie Mellon University, Nature of Reason.(The last part is the name of the course for which the assignment was submitted.)
Wang, Hao (1957). The axiomatization of arithmetic. Journal of Symbolic Logic, vol.22, no.2. pages 145-58.
Barwise, Jon and John Etchemendy (1996). The Language of First-Order Logic, Third revised and expanded edition, CSLI, Stanford, CA.
Schlimm, Dirk (2002, January 28). Handout #1: Terminology for Proofs and Arguments. Carnegie Mellon University, Nature of Mathematical Reasoning.
Schlimm, Dirk (2002, February 4). Lecture 9: On Proofs by Contradiction. Carnegie Mellon University, Nature of Mathematical Reasoning.
Van Zandt, Steven (2000, April 26). Conversation with the author.
O'Connor, J.J. and E. F. Robertson, Euclid of Alexandria, The MacTutor History of Mathematics archive. http://www-history.mcs.st-andrews.ac.uk/history/References/Euclid.html (Accessed March 4, 2002)To practice a critical approach to information available on the web, here is a Tutorial for evaluating information on the web by Carnegie Mellon University Libraries (takes 30 minutes).
Sullivan, Ed (1964, June 6). The Ed Sullivan Show. CBS.
Instead of writing the year in brackets after the name, you can also write it at the end of the citation (without brackets).