World Bank -Washington, DC, US, UNDP -New York, NY, US, y Nairobi, K. E. U. N. E. P. -,
«Aral Sea program - phase 1 : briefing paper for the proposed donors' meeting to be held on June 23-24, 1994 in Paris». World Bank Europe and Central Asia Region, Aral Sea Program Unit, Washington, DC, USA, p. ix, 46 p., 1994.
H. P. Ritzema,
Drainage principles and applications, 2nd rev. ed.ª ed., vol. no. 16. Wageningen, The Netherlands: International Institute for Land Reclamation and Improvement, 1994, p. 1125 p. : fig., tab.
O. Langenegger,
«Groundwater quality and handpump corrosion in [West] Africa», vol. no. 8. UNDP-World Bank Water and Sanitation Program, Washington, DC, USA, p. xx, 143 p.: 85 fig., 23 tab., 1994.