The American Society of African Culture, 1966
Buku Teks
South African Institute of International Affairs , 2001
Buku Teks
edited by Jacqueline A. Kalley, Elna Schoeman, Marlene Burger
University of South Africa, 2005
Buku Teks
edited by Harvey G. Kebschull
Appleton-Century-Crofts , 1968
Buku Teks
United Nations , 1990
Buku Teks