D. Yohalem, McCommon, C., and Warner, D. B.,
“Community management of rural water supply and sanitation services”, vol. no. 67. World Bank, Washington, DC, USA, p. xi, 49 p.: tab., 1990.
D. Yohalem,
“Programming guide for guinea worm eradication”, vol. no. 329. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. viii, 100 p., 1990.