Coyle, D. C. (1954). The United States political system and how it works. New American Library.
Chicago-referens (17:e uppl.)Coyle, David Cushman. The United States Political System and How It Works. [New York]: New American Library, 1954.
MLA-referens (9:e uppl.)Coyle, David Cushman. The United States Political System and How It Works. New American Library, 1954.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.