Author: FUREY S. G.
Year of Publishing: 2013
Publisher: Skat Foundation
Institution: Rural Water Supply Network
Author: DANERT, K.
Year of Publishing: 2009
Institution: UNICEF, WSP, SDC, Aqua For All
Year of Publishing: 1987
Publisher: Sarvodaya Rural Technical Services
Institution: Lanka Jathika Sarvodaya Shramadana Sangamaya