Tohutoro APA (7th ed.)

Rao,p.Venugopala. (2002). Textbook of environmental engineering. PHI Learning Private Limited.

Tohutoru Kātū Chicago (17th ed.)

Rao,p.Venugopala. Textbook of Environmental Engineering. New Delhi: PHI Learning Private Limited, 2002.

Tohutoro MLA (9th ed.)

Rao,p.Venugopala. Textbook of Environmental Engineering. PHI Learning Private Limited, 2002.