Giffen, J. K. (1905). The Egyptian Sudan (2nd ed.). F.H. Revell Co..
Lua i Stíl Chicago (17ú heag.)Giffen, J. Kelly. The Egyptian Sudan. 2nd ed. New York: F.H. Revell Co., 1905.
Lua MLA (8ú heag.)Giffen, J. Kelly. The Egyptian Sudan. 2nd ed. F.H. Revell Co., 1905.
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