1. Water for Rural Communities: Helping People Help Themselves;Briscoe,1988
2. Global Consultation on Safe Water and Sanitation for the 1990s; “The New Delhi Statement”;UNDP,1990
3. Resolving Riddles of Price/Demand;van der Mandele;World Water,1988
4. Willingness to pay for water in rural area: methodological approaches and an application in Haiti;Whittington,1987
5. Project Appraisal and Planning for Developing Countries;Little,1974