Cita APA (7th ed.)

Key, V. O. (1961). Public opinion and american democracy. Alfred A. Knopf.

Cita Chicago (17th ed.)

Key, V. O. Public Opinion and American Democracy. Nueva York: Alfred A. Knopf, 1961.

Cita MLA (9th ed.)

Key, V. O. Public Opinion and American Democracy. Alfred A. Knopf, 1961.