1. Anon (1968).Fact Sheets on the Commonwealth. Central Office of Information, London. (Reference Division).
2. Anon (1968).Republic of Botswana Fact Sheet. Government Printer, Gaborone, Botswana.
3. Botswana National Assembly (1970). Question 317 of 3/11/70 (to date Hansard is not prepared).
4. Bremner, K. C. (1961). “A study of the pathogenic factors in experimental bovine oesophagostomiasis. I. An assessment of the importance of anorexia.”Australian Journal of Agricultural Research,12, 498–512.
5. Campbell, A. (1971). Acting Director of Wildlife and National Parks, Republic of Botswana. Personal Communication.