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Kotler P., . (2002). Principles of marketing. Upper Saddle River, N.J: Prentice Hall: .
Kotler P, . 2002. Principles of marketing. Upper Saddle River, N.J: Prentice Hall: .
Kotler P, . Principles of marketing. Upper Saddle River, N.J: Prentice Hall: . 2002.
