International encyclopedia of government and politics : volume 1
editor Frank N. Magill
Toppan Company, 1996
 Buku Referensi
International encyclopedia of government and politics : volume 2
editor Frank N. Magill
Toppan Company, 1996
 Buku Referensi
Bailey, Stephen K.
America politics and goverment
Voice of America Forum Lectures, 1956
 Buku Teks
Moore, John A.
The pursuit of happiness: goverment and politics in America
Macmillan, 1985
 Buku Teks
Points of view : readings in American goverment and politics
edited by Robert E. DiClerico, Allan S. Hammock
McGraw-Hill, 1992
 Buku Teks