Kotler, P. (1983). Principles of marketing (2nd ed.). Prentice-Hall.
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Dyfyniad Arddull Chicago
Kotler, Philip. Principles of Marketing. 2nd ed. London: Prentice-Hall, 1983.
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Dyfyniad MLA
Kotler, Philip. Principles of Marketing. 2nd ed. Prentice-Hall, 1983.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.