1. Karib, A. E. (1961).The Sudan Journal of Veterinary Science and Animal Husbandry,2:1, 39–46.
2. Mulligan, H. W. (1970).The African Trypanosomiases. George, Allen & Unwin, pp. 782, 793.
3. Sudan, Ministry of Animal Resources (1962). Annual Report, p. 39.