American Geographical Society's Focus on Geography. Wiley-Blackwell.
Chicago-čujuhus (17. p.)American Geographical Society's Focus on Geography. Wiley-Blackwell.
MLA-čujuhus (9. p.)American Geographical Society's Focus on Geography. Wiley-Blackwell.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.