Bhatnagar Aditya. (2010). Principles of environmental studies. Oxford University Press.
Chicago-čujuhus (17. p.)Bhatnagar Aditya. Principles of Environmental Studies. Delhi: Oxford University Press, 2010.
MLA-čujuhus (9. p.)Bhatnagar Aditya. Principles of Environmental Studies. Oxford University Press, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.