LEWIS, BERNARD. "Slavery." Race and Slavery in the Middle East: An Historical Enquiry. : Oxford University Press, 1992-06-18. Oxford Scholarship Online. 2011-10-03. Date Accessed 25 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195053265.001.0001/acprof-9780195053265-chapter-1>.
LEWIS, B.(1992-06-18). Slavery. In Race and Slavery in the Middle East: An Historical Enquiry. : Oxford University Press. Retrieved 25 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195053265.001.0001/acprof-9780195053265-chapter-1.
LEWIS, BERNARD. "Slavery." In Race and Slavery in the Middle East: An Historical Enquiry. : Oxford University Press, 1992-06-18. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195053265.001.0001/acprof-9780195053265-chapter-1.
LEWIS B. Slavery. In: Lewis B. Race and Slavery in the Middle East: An Historical Enquiry. Oxford University Press; 1992. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195053265.001.0001/acprof-9780195053265-chapter-1. Accessed May 25, 2013.