Chopra, J. K. (2019). Environmental ecology. Unique Publishers (I) pvt. Ltd..
Chicago Style aipamenaChopra, J. K. Environmental Ecology. New Delhi: Unique Publishers (I) pvt. Ltd., 2019.
MLA aipamenaChopra, J. K. Environmental Ecology. Unique Publishers (I) pvt. Ltd., 2019.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.