↑ Cultural Atlas of Africa, pp. 48 (Dr. Jocelyn Murray, 1998) ↑ Guide to African history. pp.9 (1971, by Basil Davidson) ↑ Mwakikagile, page 206 ↑ Writing African History pp. 303 (2007, ed John Edward Philips, art Dr Isaac Olawale Albert) ↑ African empires and civilizations: ancient and medieval (1992, by George O Cox) ↑ African glory: the story of vanished Negro civilizations pp. 77, (Prof. John Coleman De Graft-Johnson, 1954) ↑ Africa in History (1995, Basil Davidson) ↑ Ehret, Christopher (2002).