Pergamon Press, 1980
Buku Teks
Rollason, Russell G., author
Alternative Pub. Cooperative, 1981
Buku Teks
Unesco, 1976
Buku Teks
edited by Michael Stohl and Harry R. Targ
Schenkman Publishing Company, 1982
Buku Teks
Bedjaoui, Mohammed, author
Gunung Agung, 1983
Buku Teks