R. B. Isely,
“Evaluation of health and social benefits of springs capped for irrigation, further adapted for domestic use in Central Tunisia”, vol. no. 84. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. iii, 58 p.: fig., tab., 1983.
A. Oendo,
“Water, health and the community in Kibwezi”. African Medical and Research Foundation (AMREF), Nairobi, Kenya, p. 34 p.: fig., 1983.