Cooper. Business Research Methods. Tata Mc Graw Hill.
Chicago-čujuhus (17. p.)Cooper. Business Research Methods. Chennai: Tata Mc Graw Hill.
MLA-čujuhus (9. p.)Cooper. Business Research Methods. Tata Mc Graw Hill.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.