1. M.W. Rosegrant, X. Cai, S.A. Cline, Global Water Outlook to 2025 – Averting an Impending Crisis. International Food Policy Research Institute, Washington (2002).
2. Sparks Companies Inc. Global water and food outlook (2003).
3. The pending water crisis;Bliss;Quaker Eco-Bulletin,2002
4. Center for Strategic and International Studies, global water futures. Sandia National Laboratories (2005).
5. Wastewater minimisation;Wang;Chem. Eng. Sci.,1994