APA Edition Citation

Verma, P. S., & Agarwal, V. K. (1989). Principles of ecology. S.Chand & Co..

Chicago Edition Citation

Verma, P. S., and V. K. Agarwal. Principles of Ecology. New Delhi: S.Chand & Co., 1989.

MLA Edition Citation

Verma, P. S., and V. K. Agarwal. Principles of Ecology. S.Chand & Co., 1989.