OConnor, Karen
American government
Addison Wesley Longman, 2001
 Buku Teks
Geer, John Gray
Gateways to democracy: an introduction to American government
Wadsworth and Cengage Learning, 2012
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Corry, J. A.
Democratic government and politics / J.A. Corry
University of Toronto Press, 1960
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Woll, Peter
Constitutional Democracy Policies and Politics
Little, Brown, 1982
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Wilson, James Q.
American government : institutions and policies
D.C. Heath, 1995
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