* Barkindo, Bawuro, "The early states of the Central Sudan: Kanem, Borno and some of their neighbours to c. 1500 A.D.", in: J. Ajayi und M. Crowder (Hg.
==Further reading==*Barkindo, Bawuro, "The early states of the Central Sudan: Kanem, Borno and some of their neighbours to c. 1500 A.D.", in: J. Ajayi und M. Crowder (Hg.