Cita APA

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

Citación estilo Chicago

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

Cita MLA

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