Achmad Jainuri, author
McGill University Montreal, 1992
Buku Teks
Schapiro, J. Salwyn
McGraw-Hill Book Company, Inc., 1950
Buku Teks
Button, John, author
Cassell, 1995
Buku Referensi
Margolies, Edward
Lippincott, 1969
Buku Teks
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
Buku Teks