APA (7th ed.) Citation

Kotler, P., & Armstrong, G. (2001). Principles of marketing (9th ed.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 9th ed. Upper Saddle River, New Jersey: Prentice-Hall, 2001.

MLA (9th ed.) Citation

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 9th ed. Prentice-Hall, 2001.