Dyfyniad APA
Billings, R. B., & Jones, C. V. (2008). Forecasting urban water demand (2nd ed.). American Water Works Association.
Dyfyniad Arddull Chicago
Billings, R. Bruce, and Clive Vaughan Jones. Forecasting Urban Water Demand. 2nd ed. Denver, Colo.: American Water Works Association, 2008.
Dyfyniad MLA
Billings, R. Bruce, and Clive Vaughan Jones. Forecasting Urban Water Demand. 2nd ed. American Water Works Association, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.