Huntington, Samuel P.
American politics
The Belknap Press, 1981
 Buku Teks
The politics of American government
Stephen J. Wayne [et all.]
Thomson, 2005
 Buku Teks SO
Barone, Michael
The almanac of American politics 1990
National Journal, 1992
 Buku Referensi
Barone, Michael
The Almanac of American politics 1990
National Journal, 1990
 Buku Referensi
Davis, David Howard
American environmental politics
Nelson-Hall Publishers, 1999
 Buku Teks