Cita APA (7a ed.)

Key, V. (1964). Politics,parties and pressures groups (5a. ed.). Crowell.

Cita Chicago Style (17a ed.)

Key, V.O. Politics,parties and Pressures Groups. 5a. ed. New York: Crowell, 1964.

Cita MLA (8a ed.)

Key, V.O. Politics,parties and Pressures Groups. 5a. ed. Crowell, 1964.