APA-čujuhus (7. p.)
Boyd, H. W., & Westfall, R. (1985). Marketing research: Text and cases (6th ed.). Irwin.
Chicago-čujuhus (17. p.)
Boyd, Harper W., juo Ralph Westfall. Marketing Research: Text and Cases. 6th ed. Illinois: Irwin, 1985.
MLA-čujuhus (9. p.)
Boyd, Harper W., juo Ralph Westfall. Marketing Research: Text and Cases. 6th ed. Irwin, 1985.
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