Calhoun, John Caldwell
- Encyclopedia Americana biography of Calhoun, who served as vice president under both John Quincy Adams (1825-1829) and Andrew Jackson (1829-1833)
- http://ap.grolier.com/article?assetid=0071230-00

Remarks of Mr. Calhoun of South Carolina on the Bill to Prevent the Interference of Certain Federal Officers in Elections
- Speech delivered in the U.S. Senate on February 22, 1839. In plain text, or as a zip file, at Project Gutenberg.
- http://www.gutenberg.org/etext/740

John C. Calhoun's Speech to the United States Senate against the Compromise of 1850, 4 March 1850
- Images of the original manuscript of his last Senate speech. From the American Memory project, Library of Congress.
- http://rs6.loc.gov/cgi-bin/query/r?ammem/mcc:@field(DOCID+@lit(mcc/009))

John C. Calhoun
- Calhoun's life and political context, together with the text of his "Disquisition on Government" and a bibliography. From the site, American Studies at the University of Virginia.
- http://xroads.virginia.edu/~CAP/CALHOUN/jcchome.html