Donald, C. (2020). Business Research Methods (12th edition.). McGraw Hill.
Chicago-čujuhus (17. p.)Donald, Cooper. Business Research Methods. 12th edition. New Delhi: McGraw Hill, 2020.
MLA-čujuhus (9. p.)Donald, Cooper. Business Research Methods. 12th edition. McGraw Hill, 2020.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.