APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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