APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Key, Valdimer Orlando. Politics, Parties and Pressure Groups. 4th ed. Crowell, 1958.