Berkowitz, E. N. (1997). Marketing (5th ed.). Irwin.
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Dyfyniad Arddull Chicago
Berkowitz, Eric N. Marketing. 5th ed. Chicago, Ill.: Irwin, 1997.
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Dyfyniad MLA
Berkowitz, Eric N. Marketing. 5th ed. Irwin, 1997.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.