Ferguson, John H.
The American system of government
McGraw-Hill, 1981
 Buku Teks
Ferguson, John H.
The American system of government
McGraw-Hill, 1965
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Griffith, Ernest S.
The American system of government
Frederick A. Praeger, 1954
 Buku Teks SO
American government
by Susan Welch ... [and others]
Thomson, 2006
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Sayre, Wallace S.
American government
Barnes & Noble, 1964
 Buku Teks