Cita APA

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

Citación estilo Chicago

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

Cita MLA

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