1. Zaghi C. I Russi (1973), Naples, 1973.
2. Wingate R. Wingate of the Sudan. London, 1955.
3. Tignor R. L. Modernisation and British colonial rule in Egypt, 1882–1914. Princeton, 1966.
4. Thuriaux-Hennebert A. Les Zande dans l'Histoire du Bahr et Ghazal et de l'Équatoria. Brussels, 1964.
5. Great Britain, War Office , Précis of information obtained by the British mission to Abyssinia. London, 1897 (restricted circulation).