1. Water
2. Berner, E. K. and Berner, R. A. 1987.The Global Water Cycle: Biochemistry and Environment.13–14. Reprint. Adapted by permission of Prentice Hall. Englewood Cliffs, New Jersey, USA
3. An Assessment of the World Water Situation by 2000
4. Doxiadis, C. A. 1967.Water for Human Environment.33–60. Proceedings of the conference “Water for Peace.” Volume 1. Washington