एपीए उद्धरण

Rao, P. V. (2006). Principles of environmental science and engineering. Prentice-Hall of India.

शिकागो स्टाइल उद्धरण

Rao, P. Venugopala. Principles of Environmental Science and Engineering. New Delhi: Prentice-Hall of India, 2006.

एमएलए उद्धरण

Rao, P. Venugopala. Principles of Environmental Science and Engineering. Prentice-Hall of India, 2006.