1. ASCE AWWA and CSSE “General Design Consideration ” Water Treatment Plant Design American Water Works Association Inc. New York N.Y. 1969 p. 17.
2. Becker W. F. Pricate Communication Central Region General Water Works Corporation Harrisburg Pa. Mar. 1980.
3. Brown and Caldwell Consulting Engineers “Interim Report Residential Conservation Projects ” Prepared for U.S. Department of Housing and Urban Development Feb. 1983 p. 1–2.
4. Buskirk E. D. and Cole C. A. “Water Conservation Attitudes and Practices of Residents in Sprirgettsbury Township Pennsylvania ” Proceedings of the International Federation of Automatic Control Water and Related Land Resources Systems Cleveland Ohio May 28–31 1980.
5. Cole C. A. Buskirk E. D. and Franz W. “Economic Analysis of Potential Impact of Water Saving Toilets ” Proceedings of DOE Conference Energy Optimization of Water and Wastewater Management New Orleans La. Dec. 1979 pp. 101–115.