APA (7th ed.) Citation

Lewis, E. (1954). Medieval political ideas. Knopf.

Chicago Style (17th ed.) Citation

Lewis, Ewart. Medieval Political Ideas. New York: Knopf, 1954.

MLA (9th ed.) Citation

Lewis, Ewart. Medieval Political Ideas. Knopf, 1954.

Warning: These citations may not always be 100% accurate.