Sage Publications, Lond
Buku Teks
Badie, Bertrand, author
University of Chicago Press, 1983
Buku Teks
Stewart, Elbert W.
Tata McGraw-Hill, 1981
Buku Teks
Henslin, James M., author
Allyn and Bacon, 2001
Buku Teks
Himelfarb, Alexander
McGraw-Hill Ryerson, 1982
Buku Teks