Dyfyniad APA
(2014). Safety management for utilities (Seventh edition.). American Water Works Association.
Dyfyniad Arddull Chicago
Safety Management for Utilities. Seventh edition. Denver, Colorado: American Water Works Association, 2014.
Dyfyniad MLA
Safety Management for Utilities. Seventh edition. American Water Works Association, 2014.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.