APA
Sankar U. (., . (2001). Environmental economics. New Delhi: Oxford University Press.
Chicago
Sankar Ulaganathan (ed.), . 2001. Environmental economics. New Delhi: Oxford University Press.
Harvard
Sankar U. (., . (2001). Environmental economics. New Delhi: Oxford University Press.
MLA
Sankar Ulaganathan (ed.), . Environmental economics. New Delhi: Oxford University Press. 2001.