@book{6804,
	author = {Roark Philip, Hodgkin Jonathan, Wyatt Alan. and Environmental Health Project. and World Health Organization. Division of Operational Support in Environmental Health.},
	title = {Models of management systems for the operation and maintenance of rural water supply and sanitation facilities.},
	publisher = {World Health Organization,},
	year = {1993.},
	address = {Geneva : }
}