edited by Norman and Ngaire Douglas
Angus & Robertson, 1989
Buku Referensi
Corris, Peter
University Press, 1973
Buku Teks
Ranney, Austin, author
American Enterprise Institute, 1985
Buku Teks
Belshaw, Cyril S., author
Royal Institute of International Affairs, 1950
Buku Teks
Wendt, Albert, author
Longman Paul, 1977
Buku Teks