1. EXPEDITION DISCOVERY 1967
2. OKAVANGO RIVER 1861
3. BIRMINGHAM, D, HIST CENTRAL AFRICA: 1 (1983).
4. BRAIN, C.K., MADOQUA 10: 285 (1977).
5. Brooks A. Gi: A Stone Age archaeological site in the northern Kalahari Desert: Botswana paper presented at the Eighth Pan-African Congress on Prehistory and Quarternary Studies Nairobi 9 September (1977).