APA (7th ed.) Citation

Kotler, P., & Armstrong, G. (1999). Principles of marketing (9 ed.). Prentice Hall.

Chicago Style (17th ed.) Citation

Kotler, Philip, and Gray Armstrong. Principles of Marketing. 9 ed. London ; New York: Prentice Hall, 1999.

MLA (9th ed.) Citation

Kotler, Philip, and Gray Armstrong. Principles of Marketing. 9 ed. Prentice Hall, 1999.