Kimble, George H.T.
Tropical Africa; Volume 1
Twentieth Century Fund, 1960
 Buku Teks SO
Coughlan, Robert
Tropical Africa
Time Incorporated, 1962
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Thomas, Howard
Africa: the future of management education, volume 2
Emerald, 2017
 eBooks
The demography of tropical Africa
by William Brass ... [et al.]
Princenton University Press, 1968
 Buku Teks SO
The population of tropical Africa
edited by John C. Caldwell and Chukuka Okonjo
Longmans, Green, 1968
 Buku Teks SO