1. D. Hinrichsen, B. Robey, A.M. Upadhyay and U.D. Upadhyay, Population reports, Center for Communication Programs, Johns Hopkins School of Public Health, Baltimore, MD, Vol. 26, No 1, 1998.
2. M. McCarthy, Water scarcity could affect billions: Is this the biggest crisis of all? Independent UK, 2003.
3. Improving sustainability and quality in urban drinking water supplies;Graham,2001
4. Study of the inter-relationship between water use and energy conservation for a building;Cheng;Energy Building,2002
5. Malaysia Water Industry Guide;The Malaysian Water Association,2001