1. Staff report of the water utility industry in the United States;American Water Works Association;J. Am. Water Works Assoc.,1966
2. Fair , Gordon M. John C. Geyer Daniel A. Okun Water and Wastewater EngineeringWater Supply and Wastewater Removal 1 18 14 John Wiley & Sons New York 1966
3. Fourt , Louis Forecasting the urban residential demand for water, Unpublished research paper Chicago 1958
4. Geyer , John C. Jerome B. Wolff F. P. Linaweaver Jr. Final and Summary Report on Phase One 1963
5. Progress report;Geyer;J. Am. Water Works Assoc.,1964