Schapiro, J. Salwyn
McGraw-Hill Book Company, Inc., 1950
Buku Teks
Achmad Jainuri
McGill University Montreal, 1992
Buku Teks
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
Buku Teks
Varga, Eugen, 1879-1964
Foreign Languages Publishing House, 1961
Buku Teks
Kohn, Hans
D. Van Nostrand, 1965
Buku Teks