1. Adekunle, J. (1994). Borgu and Economic Transformation 1700–1900: The Wangara Factor. African Economic History, (22), 1–18.
2. Alpern, S. (2005). Did They or Didn’t They Invent It? Iron in Sub-Saharan Africa. History in Africa, 32, 41–94.
3. Asante, M. (2007). The History of Africa: The Quest for Eternal Harmony. New York: Routledge.
4. Austen, R. A. (2010). Trans-Sahara Africa in World History. New York: Oxford University Press Inc.
5. Austin, G. (2004). Markets with and without, and in spite of States: West Africa in the Pre-colonial Nineteenth Century. Working Paper No. 03/04, Presented, 1st GEHN Conference, Bankside, London.