Plano, Jack C., author
The American political dictionary
Holt, Rinehart and Winston, 1985
 Buku Referensi
Masannat, George S., author
The American political system: introductory readings
Charlies Scribuner's Sons, 1971
 Buku Teks
Walker, Edward Everett, 1900-1974, author
Government of the United States
Charles Scribner's Sons, 1943
 Buku Teks
Coyle, David Cushman, 1887-1969, author
The United States political system and how it works
A Mentor Book, 1963
 Buku Teks
Shils, Edward, author
Political Development in the New States
Mouton, 1968, 1962
 Buku Teks
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