International Water Management Institute -Battaramulla, LK, IWMI,
“IWMI-Tata water policy program”, vol. No. 1. International Water Management Institute (IWMI), Colombo, Sri Lanka, p. 6 p. : 4 boxes, 4 figures, 1 photogr., 1 table.
USAID -Washington, DC, US and Horsley and Witten -Sandwich, MA, US,
“Source water protection: a training manual for communities in Nicaragua”. US Environmental Protection Agency (EPA), Washington, DC, USA, p. 57 p. : fig., fotographs.