Coyle, D. C. (1954). The United States political system and how it works. New American Library.
Citace podle Chicago (17th ed.)Coyle, David Cushman. The United States Political System and How It Works. Nueva York: New American Library, 1954.
Citace podle MLA (9th ed.)Coyle, David Cushman. The United States Political System and How It Works. New American Library, 1954.
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