Batra,Sanjay Kumar & others. (2015). Environmental Studies. Taxmans.
Chicago-čujuhus (17. p.)Batra,Sanjay Kumar & others. Environmental Studies. New Delhi: Taxmans, 2015.
MLA-čujuhus (9. p.)Batra,Sanjay Kumar & others. Environmental Studies. Taxmans, 2015.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.