APA (7th ed.) Citation

Kotler, P., Armstrong, G., Sounders, J., & Wong, V. (1999). Principles of marketing (2nd ed.). London.

Chicago Style (17th ed.) Citation

Kotler, Philip, Gary Armstrong, John Sounders, and Veronica Wong. Principles of Marketing. 2nd ed. Prentice-Hall Europe: London, 1999.

MLA (9th ed.) Citation

Kotler, Philip, et al. Principles of Marketing. 2nd ed. London, 1999.