Rao, P. V. (2006). Principles of environmental science and engineering. Prentice-Hall of India.
استشهاد بنمط شيكاغوRao, P. Venugopala. Principles of Environmental Science and Engineering. New Delhi: Prentice-Hall of India, 2006.
MLA استشهادRao, P. Venugopala. Principles of Environmental Science and Engineering. Prentice-Hall of India, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.