Legum, Colin
South Africa : crisis for the West
Frederick A. Praeger, 1964
 Buku Teks SO
Saul, John S.
The crisis in South Africa: class defense, class revolution
Monthly Review Press, 1981
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Farer, Tom J.
War clouds on the Horn of Africa: a crisis for detente
Carnegie Endowment for International Peace, 1976
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Cato, Nancy
The heart of the continent
New English Library, 1989
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Murdock, George Peter
Africa
McGraw-Hill, 1959
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