Cohn, Theodore H., author
Longman, 2003
Buku Teks
Gill, Stephen, author
John Hopkins University Press, 1988
Buku Teks
Beck, Ulrich, author
Malden, MA :Polity Press, 2005
Buku Teks
Gilpin, Robert, author
Princeton University Press, 1987
Buku Teks
Oatley, Thomas, author
Pearson, 2012
Buku Teks