Rao,p.Venugopala. (2002). Textbook of environmental engineering. PHI Learning Private Limited.
Chicago-čujuhus (17. p.)Rao,p.Venugopala. Textbook of Environmental Engineering. New Delhi: PHI Learning Private Limited, 2002.
MLA-čujuhus (9. p.)Rao,p.Venugopala. Textbook of Environmental Engineering. PHI Learning Private Limited, 2002.
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