APA Edition Citation

DHALIWAL, G. S., & KUKAL, S. S. (2008). ESSENTIAL OF ENVIRONMENTAL SCIENCE.

Chicago Edition Citation

DHALIWAL, G S., and S S. KUKAL. ESSENTIAL OF ENVIRONMENTAL SCIENCE. LUDHIANA, KALYANI, 2008.

MLA Edition Citation

DHALIWAL, G S., and S S. KUKAL. ESSENTIAL OF ENVIRONMENTAL SCIENCE. 2008.