J. O. Onjala,
« Managing water scarcity in Kenya : industrial responses to tariffs and regulatory enforcement ». Roskilde University, Department of Environment, Technology and Social Studies, Roskilde, Denmark, p. 329 p. : 7 boxes, 34 fig., 39 tabs., 2002.
J. K. Ahmad, Goldar, B. N., Jakariya, M., et Misra, S.,
« Willingness to pay for arsenic-free, safe drinking water in rural Bangladesh : methodology and results ». Water and Sanitation Program - South Asia, New Delhi, India, p. 16 p. : 2 fig., photogr., 4 tab., 2002.