Hawkins, D. I., & Tull, D. S. (1993). Essentials of marketing research (6th ed.). Macmillan.
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Dyfyniad Arddull Chicago
Hawkins, Del I., and Donald S. Tull. Essentials of Marketing Research. 6th ed. New York: Macmillan, 1993.
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Dyfyniad MLA
Hawkins, Del I., and Donald S. Tull. Essentials of Marketing Research. 6th ed. Macmillan, 1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.