“Introduction: Slavery in Sudan: Definitions and Outlines.” War and Slavery in Sudan, by Jok Madut Jok, University of Pennsylvania Press, Philadelphia, 2001, pp. 1–18, www.jstor.org/stable/j.ctt3fhsp2.5. Accessed 13 Aug. 2020.
Jok, J. (2001). Introduction: Slavery in Sudan: Definitions and Outlines. In War and Slavery in Sudan (pp. 1-18). Philadelphia: University of Pennsylvania Press. Retrieved August 13, 2020, from www.jstor.org/stable/j.ctt3fhsp2.5
Jok, Jok Madut. "Introduction: Slavery in Sudan: Definitions and Outlines." In War and Slavery in Sudan, 1-18. Philadelphia: University of Pennsylvania Press, 2001. Accessed August 13, 2020. www.jstor.org/stable/j.ctt3fhsp2.5.
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