Cita APA (7th ed.)

Kotler, P., & Armstrong, G. (1989). Principles of marketing (4th ed.). National Book Store.

Cita Chicago (17th ed.)

Kotler, Philip, i Gary Armstrong. Principles of Marketing. 4th ed. Manila: National Book Store, 1989.

Cita MLA (9th ed.)

Kotler, Philip, i Gary Armstrong. Principles of Marketing. 4th ed. National Book Store, 1989.