Dyfyniad APA

Viessman, W. (2005). Water supply and pollution control. New Jersey: Pearson Education International.

Dyfyniad Arddull Chicago

Viessman, Warren. Water Supply and Pollution Control. New Jersey: Pearson Education International, 2005.

Dyfyniad MLA

Viessman, Warren. Water Supply and Pollution Control. New Jersey: Pearson Education International, 2005.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.