Birn, R. (2004). The effective use of market research: How to drive and focus better business decisions (4th ed.). Kogan Page.
Chicago-čujuhus (17. p.)Birn, Robin. The Effective Use of Market Research: How to Drive and Focus Better Business Decisions. 4th ed. London ; Sterling, VA: Kogan Page, 2004.
MLA-čujuhus (9. p.)Birn, Robin. The Effective Use of Market Research: How to Drive and Focus Better Business Decisions. 4th ed. Kogan Page, 2004.
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