APA (7th ed.) Citation

Kotler, P., & Armstrong, G. (2001). Principles of marketing (Ninth edition.). Prentice Hall.

Chicago Style (17th ed.) Citation

Kotler, Philips, and Gary Armstrong. Principles of Marketing. Ninth edition. New Jersey: Prentice Hall, 2001.

MLA (9th ed.) Citation

Kotler, Philips, and Gary Armstrong. Principles of Marketing. Ninth edition. Prentice Hall, 2001.