Viessman, W. (2005). Water supply and pollution control. New Jersey: Pearson Education International.
Dyfyniad Arddull ChicagoViessman, Warren. Water Supply and Pollution Control. New Jersey: Pearson Education International, 2005.
Dyfyniad MLAViessman, 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.