References
- United Nations. 1990 . Achievements of the International Water Supply and Sanitation Decade 1981–1990. Report of Economic and Social Council A/45/327, 30pp
- United Nations Development Programme. 1990 . The New Delhi Statement. Global Consultation on Safe Water and Sanitation for the 1990's, 10–14 Sept. 1990, New Delhi, India, 7pp