Bowen, Elizabeth, 1899-1973, author
Continental Book Company, 1946
Buku Teks
Yayasan Proklamasi, Centre for Strategic and International Studies, 1983
Buku Teks
edited by Werner J. Feld
Westview Press, 1985
Buku Teks
Aubrey, Henry G., author
Frederick A. Praeger, 1967
Buku Teks
Mitchell, Robin, author
Gadsonbury, 1990
Buku Teks