Kohler, H. (1992). Economics. D.C. Heath and Company.
Chicago-čujuhus (17. p.)Kohler, Heinz. Economics. Lexington: D.C. Heath and Company, 1992.
MLA-čujuhus (9. p.)Kohler, Heinz. Economics. D.C. Heath and Company, 1992.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.