APA (7th ed.) Zitazioa

Coyle, D. C. (1954). The United States political system and how it works. New American Library.

Chicago Style (17th ed.) Zitazioa

Coyle, David Cushman. The United States Political System and How It Works. Nueva York: New American Library, 1954.

MLA (9th ed.) Zitazioa

Coyle, David Cushman. The United States Political System and How It Works. New American Library, 1954.