APA-referens

Verma, P. S., & Agarwal, V. K. (2004). Environmental biology: Principles of ecology. S. Chand & Co.

Chicago-stil citat

Verma, P. S., och V. K. Agarwal. Environmental Biology: Principles of Ecology. New Delhi: S. Chand & Co, 2004.

MLA-referens

Verma, P. S., och V. K. Agarwal. Environmental Biology: Principles of Ecology. S. Chand & Co, 2004.