DESAI, R. J. ENVIRONMENTAL STUDIES 7TH ED 2008.
Chicago-čujuhus (17. p.)DESAI, RASHMI J. ENVIRONMENTAL STUDIES 7TH ED 2008.
MLA-čujuhus (9. p.)DESAI, RASHMI J. ENVIRONMENTAL STUDIES 7TH ED 2008.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.