From the ninth to the early 20th century, probably as many black Africans were forcibly taken across the Sahara, up the Nile valley, and across the Red Sea, as were transported across the Atlantic in a much shorter period. This work provides an introduction to this other slave trade.
Very important book examining the enslavement of black Africans in the Muslim world. Also has some translations of important Muslim texts dealing with the issue of slavery in Islam