Cita APA (7th ed.)

Asthana, D. K., & Asthana, M. (1998). Environment: Problems and Solutions. S. Chand & Company Ltd..

Cita Chicago (17th ed.)

Asthana, D. K., i Meera Asthana. Environment: Problems and Solutions. New Delhi: S. Chand & Company Ltd., 1998.

Cita MLA (9th ed.)

Asthana, D. K., i Meera Asthana. Environment: Problems and Solutions. S. Chand & Company Ltd., 1998.