APA Style

Verma, P., Agarwal, V, K. (2005). Environmental Biology ( Principles of Ecology) (First Edition 1983 Reprint2005). New Delhi: S. Chand & Company Ltd.

MLA Style

Verma, P.S.., Agarwal, V., K.. "Environmental Biology ( Principles of Ecology)". First Edition 1983 Reprint2005 New Delhi: S. Chand & Company Ltd, 2005. Text.