Não informado. (1962). Foreign trade statistics for Africa. United Nations, Economic Commission for Africa.
Chicago-referens (17:e uppl.)Não informado. Foreign Trade Statistics for Africa. New York: United Nations, Economic Commission for Africa, 1962.
MLA-referens (8:e uppl.)Não informado. Foreign Trade Statistics for Africa. United Nations, Economic Commission for Africa, 1962.
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