JOHNSON, P. &. o. BUSINESS ECONOMICS.
Chicago-čujuhus (17. p.)JOHNSON, P.A. & others. BUSINESS ECONOMICS.
MLA-čujuhus (9. p.)JOHNSON, P.A. & others. BUSINESS ECONOMICS.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.