APA (7th ed.) Citation

Key, V. O. (1972). Public opinion and American democracy (Repr.). Knopf.

Chicago Style (17th ed.) Citation

Key, Valdimer O. Public Opinion and American Democracy. Repr. New York: Knopf, 1972.

MLA (9th ed.) Citation

Key, Valdimer O. Public Opinion and American Democracy. Repr. Knopf, 1972.