1. Davey, T. H. (1948). Trypanosomiasis in British West Africa. Lond.: H.M. Stationery Office.
2. Fisher, R. A. (1950). Statistical methods for research workers, 11th ed. Edin.: Oliver and Boyd.
3. Glover, P. E. (1961). The tsetse problem in Northern Nigeria. Nairobi: Patwa News Agency.
4. Types ofTrypanosoma Congolense