APA (7th ed.) Citation

Key, V. O. (1958). Politics, parties, and pressure groups (4th ed.). Crowell.

Chicago Style (17th ed.) Citation

Key, V. O. Politics, Parties, and Pressure Groups. 4th ed. New York: Crowell, 1958.

MLA (8th ed.) Citation

Key, V. O. Politics, Parties, and Pressure Groups. 4th ed. Crowell, 1958.