Kotler, P., & Armstrong, G. (1999). Principles of marketing (8th ed.). Prentice Hall.
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Dyfyniad Arddull Chicago
Kotler, Philip, and Gary Armstrong. Principles of Marketing. 8th ed. Upper Saddle River, NJ ; New Delhi: Prentice Hall, 1999.
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Dyfyniad MLA
Kotler, Philip, and Gary Armstrong. Principles of Marketing. 8th ed. Prentice Hall, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.