Thoman, R. S. (1974). The geography of economic activity (3rd ed.). McGraw-Hill.
Chicago-čujuhus (17. p.)Thoman, Richard S. The Geography of Economic Activity. 3rd ed. New York: McGraw-Hill, 1974.
MLA-čujuhus (9. p.)Thoman, Richard S. The Geography of Economic Activity. 3rd ed. McGraw-Hill, 1974.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.