1. Ahrens F. (1991). “Finders of lost gas.” Am. Gas May 32–35.
2. Betz handbook for industrial water conditioning . (1991). Betz Laboratories.
3. City of Phoenix water use monitoring program: evaluation of water conservation programs: report of the 1989/1990 surveys . (1991). Prepared for Phoenix Water and Wastewater Department Planning and Management Consultants Ltd. Carbondale Ill.
4. Cunningham R. J. (1995). Maximizing cooling tower cycles of concentration . 1995 Cooling Tower Institute Annual Meeting.
5. deMonsabert S. and Liner B. (1996). “WATERGY: A water and energy conservation model for federal facilities.” CONSERV'96 Orlando Fla.