APA (7th ed.) Citation

Key, V. O. (1956). Politics, parties, and pressure groups. Crowell.

Chicago Style (17th ed.) Citation

Key, Valdimer O. Politics, Parties, and Pressure Groups. New York: Crowell, 1956.

MLA (8th ed.) Citation

Key, Valdimer O. Politics, Parties, and Pressure Groups. Crowell, 1956.