1. Global Water crisis: the major issue of the 21st century, a growing and explosive problem;Saeijs;European Water Pollution Control,,1995
2. Engelman, R. and LeRoy, P., Sustaining Water, Population and the Future of Renewable Water Supplies (Washington, DC, USA, Population and Environment Program Population Action International, 1993).
3. Ibid.
4. Seralgeldin, I., Towards Sustainable Management of Water Resources Directions in Development (Washington, DC, USA, The World Bank, 1995).
5. Gleick, P. H., Water in Crisis: A Guide to the World's Fresh water resources (Washington DC, USA, Oxford University Press, 1993).