Dyfyniad APA
Viessman, W., & Hammer, M. J. (1998). Water supply and pollution control (6th ed.). Addison Wesley.
Dyfyniad Arddull Chicago
Viessman, Warren, and Mark J. Hammer. Water Supply and Pollution Control. 6th ed. Menlo Park, CA: Addison Wesley, 1998.
Dyfyniad MLA
Viessman, Warren, and Mark J. Hammer. Water Supply and Pollution Control. 6th ed. Addison Wesley, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.