APA
Roark Philip H. J. W. A., Environmental Health Project, Water and Sanitation for Health Project & World Health Organization. Division of Operational Support in Environmental Health. (1993). Models of management systems for the operation and maintenance of rural water supply and sanitation facilities. Geneva: World Health Organization.
Chicago
Roark Philip Hodgkin Jonathan Wyatt Alan, Environmental Health Project, Water and Sanitation for Health Project and World Health Organization. Division of Operational Support in Environmental Health. 1993. Models of management systems for the operation and maintenance of rural water supply and sanitation facilities. Geneva: World Health Organization.
Harvard
Roark Philip H. J. W. A., Environmental Health Project, Water and Sanitation for Health Project and World Health Organization. Division of Operational Support in Environmental Health. (1993). Models of management systems for the operation and maintenance of rural water supply and sanitation facilities. Geneva: World Health Organization.
MLA
Roark Philip Hodgkin Jonathan Wyatt Alan, Environmental Health Project, Water and Sanitation for Health Project and World Health Organization. Division of Operational Support in Environmental Health. Models of management systems for the operation and maintenance of rural water supply and sanitation facilities. Geneva: World Health Organization. 1993.