1. 1 Report of Habitat: United Nations Conference on Human Settlements, United Nations publication, Sales No E.76.IV.7, resolution C.12, Ch II.
2. 2 Report of the United Nations Water Conference, Mar del Plata, 14-25 March 1977, United Nations publication, Sales No E.77.II.A.12, resolution II.
3. 3 Report of the United Nations Water Conference, Mar del Plata, 14-25 March 1977, United Nations publication, Sales No E.77.II.A.12, Chi.
4. 4 United Nations General Assembly, Forty-fifth Session, Report of the Economic and Social Council: Achievements of the International Drinking Water Supply and Sanitation Decade 1981-1990. Report of the Secretary-General, Document A/45/327, 13 July 1990.
5. 5 United Nations, Prospects of World Urbanization, p 76.