References
- 1989 World Population Data Sheet. Population Reference Bureau, Inc., Washington, DC 1989
- Available Data on Blindness (Update 1987). World Health Organization, Geneva 1987
- Mburu F M, Steinkuller P G. Ocular needs in Africa: Increasing priorities and shrinking resources. Soc Sci Med 1983; 17: 1687–91
- Helen Keller International, New York 1989, Unpublished data