APA (7th ed.) Citation

Kotler, P., Opresnik, M. O., & Armstrong, G. (2021). Principles of marketing (18th edition.). Pearson.

Chicago Style (17th ed.) Citation

Kotler, Philip, Marc O. Opresnik, and Gary Armstrong. Principles of Marketing. 18th edition. Harlow, England: Pearson, 2021.

MLA (9th ed.) Citation

Kotler, Philip, et al. Principles of Marketing. 18th edition. Pearson, 2021.