Boyd, H. W., & Westfall, R. (1972). Marketing research: Text and cases (3rd ed.). Irwin.
Chicago-čujuhus (17. p.)Boyd, Harper W., juo Ralph Westfall. Marketing Research: Text and Cases. 3rd ed. Illinois: Irwin, 1972.
MLA-čujuhus (9. p.)Boyd, Harper W., juo Ralph Westfall. Marketing Research: Text and Cases. 3rd ed. Irwin, 1972.
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