Dyfyniad APA

Goel P K. (2006). Water Pollution: Causes,effects and control. New Age International.

Dyfyniad Arddull Chicago

Goel P K. Water Pollution: Causes,effects and Control. New delhi: New Age International, 2006.

Dyfyniad MLA

Goel P K. Water Pollution: Causes,effects and Control. New Age International, 2006.

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