Beri. Marketing Research (5.). McGraw Hill Education.
Chicago-čujuhus (17. p.)Beri. Marketing Research. 5. Chennai: McGraw Hill Education.
MLA-čujuhus (9. p.)Beri. Marketing Research. 5. McGraw Hill Education.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.