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Woodward, Peter. Sudan 1898–1989: The Unstable State. Boulder: Lynne Rienner,

1990 and London:Lester Crook Academic Publishing, 1990.

The Sudan Handbook, edited by John Ryle, Justin Willis, Suliman Baldo and Jok Madut Jok. © 2011 Rift Valley Institute and contributors

(www.riftvalley.net).