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Bernd B. Response to Dependence in a Servile Group: the Maccube of Northern Benin. In: Miers S, Kopytoff I, editors. Slavery in Africa. Historical and Anthropological Perspectives. Madison: University of Wisconsin Press; 1977. p. 435-58.
Baier S, Lovejoy PE. The Tuareg of the Central Sudan: Gradations in Servility at the Desert Edge (Niger and Nigeria). In: Miers S, Kopytoff I, editors. Slavery in Africa. Historical and Anthropological Perspectives. Madison: University of Wisconsin Press; 1977. p. 391-410.
Grace JJ. Slvery and Emancipation among the Mende in Sierra Leone, 1896-1928. In: Miers S, Kopytoff I, editors. Slavery in Africa. Historical and Anthropological Perspectives. Madison: University of Wisconsin Press; 1977. p. 415-31.