Thakur, P. (2007). Environmental studies. ABD Publ.
Chicago-čujuhus (17. p.)Thakur, P. Environmental Studies. Jaipur: ABD Publ, 2007.
MLA-čujuhus (9. p.)Thakur, P. Environmental Studies. ABD Publ, 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.