Coyle, D. C. (1954). The United States political system and how it works. New American Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCoyle, David Cushman. The United States Political System and How It Works. [New York]: New American Library, 1954.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCoyle, David Cushman. The United States Political System and How It Works. New American Library, 1954.
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