Cita APA

Verma, P. S. (2007). Environmental biology: Principles of ecology. S. Chand & Company Ltd.

Chicago Edition Citation

Verma, P. S. Environmental Biology: Principles of Ecology. New Delhi: S. Chand & Company Ltd, 2007.

Cita MLA

Verma, P. S. Environmental Biology: Principles of Ecology. S. Chand & Company Ltd, 2007.