Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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