Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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