Cita APA (7a ed.)

Key, V. O. (1961). Public opinion and American democracy. Knopf.

Cita Chicago Style (17a ed.)

Key, Valdimer Orlando. Public Opinion and American Democracy. New York: Knopf, 1961.

Cita MLA (9a ed.)

Key, Valdimer Orlando. Public Opinion and American Democracy. Knopf, 1961.