The Columbia History of the World. Ed. John A. Garraty and Peter Gay. New York: Harper and Row, 1981.

Combs, Jerald A. The History of American Foreign Policy. New York: Knopf Publishing, 1986.

The Diary of James K. Polk. Ed. M.M. Quaife. Library material.

Lavender, David. The Mexican War: Climax of Manifest Destiny. Palo Alto: American West, 1968.

Messages and Papers of the Presidents. Ed. J.D. Richardson. Library material.

The Story of America. Ed. Elizabeth L. Newhouse. Washington, District of Columbia: The National Geographic Society, 1984.