APA Edition Citation

Chhatwal, G. R., Katyal, T., & Mehra, M. C. (1989). Environmental air pllution and its control.

Chicago Edition Citation

Chhatwal, G R., T. Katyal, and M C. Mehra. Environmental Air Pllution and Its Control. New Delhi, Anmol Publications, 1989.

MLA Edition Citation

Chhatwal, G R., et al. Environmental Air Pllution and Its Control. 1989.