Citazione Stile APA (7a Edizione)

Asthana, D. K. (2001). A Textbook of Environmental Studies. S. Chand & Company.

Citazione stile Chigago Style (17a edizione)

Asthana, D. K. A Textbook of Environmental Studies. New Delhi: S. Chand & Company, 2001.

Citatione MLA (9a ed.)

Asthana, D. K. A Textbook of Environmental Studies. S. Chand & Company, 2001.