Asthana, D. K., & Asthana, M. (1998). Environment: Problems and Solutions. S. Chand & Company Ltd..
Citazione stile Chigago Style (17a edizione)Asthana, D. K., e Meera Asthana. Environment: Problems and Solutions. New Delhi: S. Chand & Company Ltd., 1998.
Citatione MLA (9a ed.)Asthana, D. K., e Meera Asthana. Environment: Problems and Solutions. S. Chand & Company Ltd., 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.