1. Orr J. B. and Gilks J. L. , Studies in Nutrition: The Physique and Health of Two African Tribes.
2. Huxley Julian , Africa View.
3. Journal of the Royal African Society, January 1938.
4. A Population Map of Tanganyika Territory;American Geographical Review,1936
5. Leakey L. S. B. , e.g. in Kenya: Contrasts and Problems (1935)