Ferguson, J. H., & McHenry, D. E. (1967). The American system of government. New York: McGraw-Hill Book Company.
Trích dẫn kiểu ChicagoFerguson, John H., và Dean E. McHenry. The American System of Government. New York: McGraw-Hill Book Company, 1967.
Deismireacht MLAFerguson, John H., và Dean E. McHenry. The American System of Government. New York: McGraw-Hill Book Company, 1967.
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