“Preface.” War and Slavery in Sudan, by Jok Madut Jok, University of Pennsylvania Press, Philadelphia, 2001, pp. vii-xv, www.jstor.org/stable/j.ctt3fhsp2.3. Accessed 11 Aug. 2020.
Jok, J. (2001). Preface. In War and Slavery in Sudan (pp. Vii-Xv). Philadelphia: University of Pennsylvania Press. Retrieved August 11, 2020, from www.jstor.org/stable/j.ctt3fhsp2.3
Jok, Jok Madut. "Preface." In War and Slavery in Sudan, Vii-Xv. Philadelphia: University of Pennsylvania Press, 2001. Accessed August 11, 2020. www.jstor.org/stable/j.ctt3fhsp2.3.
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