Fausold, Martin L., and Alan Shank, eds.The Constitution and the American Presidency. State University of New York Press, 1991. A collection of essays about the status of the Constitution on issues concerning the presidency from Jefferson to Truman.
Levy, Leonard W., and Kenneth L. Karst, eds.Encyclopedia of the American Constitution. Macmillan, 1986. Reference set with essays on the Constitution of the United States.