Hatch, John
Africa today and tomorrow: an outline of basic facts and major problems
Frederick A. Praeger, 1962
 Buku Teks SO
Hailey, William Malcolm Hailey, Baron, 1872-1969
An African survey : a study of problems arising in Africa south of the Sahara
Oxford University Press, 1957
 Buku Teks SO
Murdock, George Peter
Africa
McGraw-Hill, 1959
 Buku Teks
Murdock, George Peter
Africa
McGraw-Hill, 1959
 Buku Teks
Africa
edited by Phillis M. Martin and Patrick O'Meara
Indiana University Press, 1995
 Buku Teks SO