APA (7th ed.) Citation

Kotler & Armstrong. (2001). Principles of marketing (9th ed.). Prentice Hall.

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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