APA-referens

Asthana, D. K., & Asthana, M. (2006). Textbook of environmental studies. S Chand & Co Ltd.

Chicago-stil citat

Asthana, D. K., och Meera Asthana. Textbook of Environmental Studies. New Delhi: S Chand & Co Ltd, 2006.

MLA-referens

Asthana, D. K., och Meera Asthana. Textbook of Environmental Studies. S Chand & Co Ltd, 2006.