APA (7th ed.) Citation

Kotler, P., & Armstrong, G. (1990). Marketing: An introduction (2nd ed.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Kotler, Philip, and Gary Armstrong. Marketing: An Introduction. 2nd ed. Englewood Cliffs, N. J: Prentice-Hall, 1990.

MLA (9th ed.) Citation

Kotler, Philip, and Gary Armstrong. Marketing: An Introduction. 2nd ed. Prentice-Hall, 1990.