Coughlan, Robert
Tropical Africa
Time Incorporated, 1962
 Buku Teks
The population of tropical Africa
edited by John C. Caldwell and Chukuka Okonjo
Longmans, Green, 1968
 Buku Teks SO
Kimble, George H.T.
Tropical Africa; Volume 2
Twentieth Century Fund, 1960
 Buku Teks SO
Kimble, George H.T.
Tropical Africa; Volume 1
Twentieth Century Fund, 1960
 Buku Teks SO
Marcus, Edward
Investment and development possibilities in tropical Africa
Bookman Associates, 1960
 Buku Teks