Cunningham, W. P., & Cunningham , M. A. (2004). Principles of environmental science : inquiry and: Applications (2nd ed.). McGraw-Hill.
Chicago-čujuhus (17. p.)Cunningham, William P., juo Mary Ann Cunningham. Principles of Environmental Science : Inquiry and: Applications. 2nd ed. Boston: McGraw-Hill, 2004.
MLA-čujuhus (9. p.)Cunningham, William P., juo Mary Ann Cunningham. Principles of Environmental Science : Inquiry and: Applications. 2nd ed. McGraw-Hill, 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.