Cita APA (7th ed.)

Key, V. O. (1964). Politics, parties, and pressure groups (5a. ed.). Thomas Y. Crowell.

Cita Chicago (17th ed.)

Key, V. O. Politics, Parties, and Pressure Groups. 5a. ed. Nueva York: Thomas Y. Crowell, 1964.

Cita MLA (9th ed.)

Key, V. O. Politics, Parties, and Pressure Groups. 5a. ed. Thomas Y. Crowell, 1964.