Sherrill, R., & Barber, J. D. (1972). Why they call it politics: A guide to America's government. New York: Harcourt Brace Jovanovich.
Trích dẫn kiểu ChicagoSherrill, Robert., và James David Barber. Why They Call It Politics: A Guide to America's Government. New York: Harcourt Brace Jovanovich, 1972.
Deismireacht MLASherrill, Robert., và James David Barber. Why They Call It Politics: A Guide to America's Government. New York: Harcourt Brace Jovanovich, 1972.
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