United Nations Economic and Social Commission for Western Asia -Beirut, LB, ESCWA,
«Assessment of water quality in the ESCWA region». United Nations, New York, NY, USA, p. ix, 143 p. : 4 fig., 15 tab., 1996.
R. Clarke,
«Groundwater : a threatened resource», vol. no. 15. UNEP, United Nations Environment Programme, Nairobi, Kenya, p. 36 p. : boxes, fig., photogr., tab., 1996.