Dyfyniad APA
American Water Works Association & ebrary, Inc. (2005). Water utility management (2nd ed.). American Water Works Association.
Dyfyniad Arddull Chicago
American Water Works Association and Inc ebrary. Water Utility Management. 2nd ed. Denver, Colo.: American Water Works Association, 2005.
Dyfyniad MLA
American Water Works Association and Inc ebrary. Water Utility Management. 2nd ed. American Water Works Association, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.