Sources
- Hunwick, John O. (2003). Timbuktu and the Songhay Empire: Al-Saʻdī's Taʼrīkh al-sūdān Down to 1613 and other Contemporary Documents. Leiden: Brill Academic Publishers. pp. 488 Pages. ISBN 90-04-12822-0.
- J. Vansina, A Comparison of African Kingdoms, Africa: Journal of the International African Institute (1962), pp. 324–335.
- Turchin, Peter and Jonathan M. Adams and Thomas D. Hall: "East-West Orientation of Historical Empires and Modern States", Journal of World-Systems Research, Vol. XII, No. II, 2006
Read more about this topic: African Empires
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