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3. Alpers, E. A. (1975b). Ivory and Slaves in East and Central Africa. Heinemann.
4. Alpers, E. A. (1977). Madagascar and Mozambique in the nineteenth century: The era of the Sakalava raids (1800–1820). Omaly sy anio, 5(6), 36–53.
5. Alpers, E. A. (2020). Ivory and Slaves in East Central Africa. University of California Press.