APA
Sharma J., . (2009). Environmental Studies (For Undergraduate Classes in Science, Commerce, Humanities, Engineering, Medicine, Pharmacy, Management and Law). New Delhi: University Science Press.
Chicago
Sharma J.P, . 2009. Environmental Studies (For Undergraduate Classes in Science, Commerce, Humanities, Engineering, Medicine, Pharmacy, Management and Law). New Delhi: University Science Press.
Harvard
Sharma J., . (2009). Environmental Studies (For Undergraduate Classes in Science, Commerce, Humanities, Engineering, Medicine, Pharmacy, Management and Law). New Delhi: University Science Press.
MLA
Sharma J.P, . Environmental Studies (For Undergraduate Classes in Science, Commerce, Humanities, Engineering, Medicine, Pharmacy, Management and Law). New Delhi: University Science Press. 2009.