K. E. U. N. E. P. - Nairobi,
Africa water atlas. Nairobi, Kenya: Division of Early Warning and Assessment, United Nations Environment Programme, DEWA / UNEP, 2010, p. x, 314 p. : 500 fig., 224 maps, photogr., 104 satellite images.
N. L. Cain,
“A different path : the global water crisis and rainwater harvesting”,
Consilience : the journal of sustainable development, pp. p. 187 - 196; 3 fig., 2010.