APA (7th ed.) Citation

Key, V. O. (1950). Politics, parties, and pressure groups (2. ed., 4. print.). Crowell.

Chicago Style (17th ed.) Citation

Key, Valdimer O. Politics, Parties, and Pressure Groups. 2. ed., 4. print. New York: Crowell, 1950.

MLA (9th ed.) Citation

Key, Valdimer O. Politics, Parties, and Pressure Groups. 2. ed., 4. print. Crowell, 1950.