Cooper, D. (2006). Business Research Methods. TMH.
Chicago-čujuhus (17. p.)Cooper, Donald. Business Research Methods. TMH, 2006.
MLA-čujuhus (9. p.)Cooper, Donald. Business Research Methods. TMH, 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.