Kotler, P., & Armstrong, G. (1999). Principles of marketing (9 ed.). Prentice Hall.
Citace podle Chicago (17th ed.)Kotler, Philip, a Gray Armstrong. Principles of Marketing. 9 ed. London ; New York: Prentice Hall, 1999.
Citace podle MLA (9th ed.)Kotler, Philip, a Gray Armstrong. Principles of Marketing. 9 ed. Prentice Hall, 1999.