Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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