Balaam, David N., 1950-
Prentice-Hall, 1996
Buku Teks
edited by W. Ladd Hollist
Westview Press, 1985
Buku Teks
Balaam, David N., 1950-
Pearson Education, 2014
Buku Teks
Gilpin, Robert
Princeton University Press, 1987
Buku Teks
Oatley, Thomas
Pearson, 2012
Buku Teks