Cofnodi Dyfyniadau
Dyfyniad APA
Lehmann, D. R. (1989). Market research and analysis (3rd ed.). Irwin.
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Dyfyniad Arddull Chicago
Lehmann, Donald R. Market Research and Analysis. 3rd ed. Homewood, IL.: Irwin, 1989.
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Dyfyniad MLA
Lehmann, Donald R. Market Research and Analysis. 3rd ed. Irwin, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.