Schmidt, Steffen W.
American Government & politics today
Wadsworth, 2009
 Buku Teks SO
Sawer, Geoffrey, 1910-1996
Australian government today
Melbourne University Press, 1973
 Buku Teks SO
Bardes, Barbara A.
American government and politics today: the essentials
Thomson/Wadsworth, 2006
 Buku Teks SO
Call, Tomme Clark
The Mexican venture
Oxford University Press, 1953
 Buku Teks SO
Starratt, Edith E.
Our American government today / Edith E. Starratt, Morris Lewenstein
Prentice-Hall, 1966
 Buku Teks SO