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Kotler, Philip, Armstrong, Gary. (1996). Principles of Marketing (Ed. 7). London: Prentice-Hall, INC..

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Kotler, Philip, Armstrong, Gary. Principles of Marketing. Ed. 7 London: Prentice-Hall, INC., 1996. Text.

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Kotler, Philip, Armstrong, Gary. Principles of Marketing. Ed. 7 London: Prentice-Hall, INC., 1996. Text.

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Kotler, Philip, Armstrong, Gary. Principles of Marketing. Ed. 7 London: Prentice-Hall, INC., 1996. Print.