Author: Deal, P. T. and Furey S. G.
Year of Publishing: 2019
Publisher: Skat Foundation
Author: WASH United, WaterAid, Institute for Sustainable Futures – University of Technology Sydney, End Water Poverty, UNICEF and RWSN, in partnership with C3
Year of Publishing: 2016
Author: PEARCE-OROZ, G.
Year of Publishing: 2011
Publisher: The World Bank
Institution: Water and Sanitation Program