Richards, D. A. J. (1989). Foundations of American constitutionalism. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRichards, David A. J. Foundations of American Constitutionalism. New York: Oxford University Press, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRichards, David A. J. Foundations of American Constitutionalism. Oxford University Press, 1989.
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