See P. M. Holt, A Modern History of the Sudan (3d ed. 1979); R. O. Collins, Shadows in the Grass: Britain in the Southern Sudan, 1918–1956 (1983); N. O'Neill and J. O'Brien, Economy and Class in the Sudan (1988); J. O. Voll, ed., Sudan (1991); P. Woodward, Sudan, 1898–1989 (1991); J. M. Burr, Africa's Thirty Years' War: Chad, Libya, and the Sudan, 1963–1993 (1999); D. Petterson, Inside Sudan (1999); R. O. Collins, A History of Modern Sudan (2009).
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