Carey, Peter, author
University of Queensland, 1987
Buku Teks
Gilman, Sander L., author
Polity Press, 2008
Buku Teks
Stavrianos, Leften Stavros, author
Allyn and Bacon, 1967
Buku Teks
Leaf, Murray J.
Columbia University Press, 1979
Buku Teks
Allyn and Bacon, 1966
Buku Teks