population of Northern Sudan, Khartoum, published by the Sudan Government. S. Hillelson, 1935, Sudan Arabic texts, Cambridge, UK: The University Press. Michel
(原始内容存档于2019-03-10). Balogun, Ismail A. B. The penetration of Islam into Nigeria. Khartum: UniversityofKhartoum, Sudan Research Unit. 1969. OCLC 427362 (英语). Kenny
[Typescript in KhartoumUniversity Library]. 1909. Foot, Edwin C. An Oromo-English, English-Oromo dictionary. Cambridge University Press (repr. Farnborough