Hill, M. (2004). understanding environmental pollution (2nd.). CUP.
Chicago-čujuhus (17. p.)Hill, Marquita. Understanding Environmental Pollution. 2nd. Cambridge: CUP, 2004.
MLA-čujuhus (9. p.)Hill, Marquita. Understanding Environmental Pollution. 2nd. CUP, 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.