International Eye Foundation, 1990.
Sheffield M, Victoria. “The Face of U.S. Assistance in the 1990’s,”
Vision Care International Ministries Inc, Savage, Maryland, USA, 1990
Henningsen MA, Introduction to Eye Care for the Local Health Worker
International Agency for Prevention of Blindness, 1990
Sheffield VM, "Management Issues in Primary Eye Care Training Programs", Proceedings of the IV Congress - Nairobi
British Journal of Ophthalmology 1990;74:333-340.
Whitfield R, Schwab L, Ross-Degnan D, et al Blindness and eye disease in Kenya: ocular status survey results from the Kenya Rural Blindness Prevention Project.