Joseph, K. (2004). Essentials of environmental studies. Pearson Education.
Chicago-čujuhus (17. p.)Joseph, Kurian. Essentials of Environmental Studies. Delhi: Pearson Education, 2004.
MLA-čujuhus (9. p.)Joseph, Kurian. Essentials of Environmental Studies. Pearson Education, 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.