Cita APA (7th ed.)

Kotler, P., & Armstrong, G. (1991). Principles of marketing (5th ed.). Prentice Hall.

Cita Chicago (17th ed.)

Kotler, Philip, i Gary Armstrong. Principles of Marketing. 5th ed. Englewood Cliffs, N.J: Prentice Hall, 1991.

Cita MLA (9th ed.)

Kotler, Philip, i Gary Armstrong. Principles of Marketing. 5th ed. Prentice Hall, 1991.