Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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