Longgood, William F.
Greenberg, 1957
Buku Teks
Polk, William R. (William Roe), 1929-
St. Martin's Press, 1979
Buku Teks SO
penyunting Machnun Husein ; penerjemah, Machnun Husein
Pustaka Pelajar, 1995
Buku Teks SO
by Institute of International Peace Studies
Kyung Hee University Press, 1983
Buku Teks SO
Walz, Jay
Atheneum, 1966
Buku Teks SO