Daniels, R. R. &. K. (2010). Environmental Studies. St. Marti's Press.
Chicago-čujuhus (17. p.)Daniels, R.J Ranjit & Krishnaswamy. Environmental Studies. New Delhi: St. Marti's Press, 2010.
MLA-čujuhus (9. p.)Daniels, R.J Ranjit & Krishnaswamy. Environmental Studies. St. Marti's Press, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.