Kotler, P., & Armstrong, G. (2006). Principles of marketing (11th ed.). Pearson/Prentice Hall.

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 11th ed. Upper Saddle River, N.J. ; New Delhi: Pearson/Prentice Hall, 2006.

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 11th ed. Pearson/Prentice Hall, 2006.