Corwin, E. S. (1957). The President, office and powers, 1787-1957: History and analysis of practice and opinion (4th rev. ed.). New York University Press.
Lua i Stíl Chicago (17ú heag.)Corwin, Edward Samuel. The President, Office and Powers, 1787-1957: History and Analysis of Practice and Opinion. 4th rev. ed. New York: New York University Press, 1957.
Lua MLA (9ú heag.)Corwin, Edward Samuel. The President, Office and Powers, 1787-1957: History and Analysis of Practice and Opinion. 4th rev. ed. New York University Press, 1957.
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