DE BLIJ, H. J. (1970). Geography regions and concepts. John Wiley and Sons.
Chicago-čujuhus (17. p.)DE BLIJ, Harm J. Geography Regions and Concepts. New York: John Wiley and Sons, 1970.
MLA-čujuhus (9. p.)DE BLIJ, Harm J. Geography Regions and Concepts. John Wiley and Sons, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.