D. B. Brooks, Rached, E., y Saade, M.,
Management of water demand in Africa and the Middle East : current practices and future needs. Ottawa, Ont, Canada: International Development Research Centre (IDRC), 1997, p. xi, 78 p. : 5 tab.
K. E. World Bank Nairobi,
«UNDP-World Bank Water and Sanitation Program : RWSG-ESA Workplan 1997». UNDP-World Bank, Regional Water and Sanitation Group Eastern and Southern Africa, Nairobi, Kenya, p. iv, 70 p., 1997.
G. Sabatinelli,
«Vector and pest control in refugee situations». United Nations High Commissioner for Refugees, Geneva, Switzerland, p. vi, 104 p., xvi p. pl. : 10 fig., 6 tab., 1997.