APA

Singh P., Singh A. & Malaviya P. (2009). Textbook of environment & ecology. New Delhi: Acme learning private limited.

Chicago

Singh Pratibha, Singh Anoop and Malaviya Piyush. 2009. Textbook of environment & ecology. New Delhi: Acme learning private limited.

Harvard

Singh P., Singh A. and Malaviya P. (2009). Textbook of environment & ecology. New Delhi: Acme learning private limited.

MLA

Singh Pratibha, Singh Anoop and Malaviya Piyush. Textbook of environment & ecology. New Delhi: Acme learning private limited. 2009.