APA Style

Kotler, Philip, Armstrong, Gary. (2021). Principles of Marketing (Ed. 18th). Essex: Pearson.

Chicago Style

Kotler, Philip, Armstrong, Gary. Principles of Marketing. Ed. 18th Essex: Pearson, 2021. Text.

MLA Style

Kotler, Philip, Armstrong, Gary. Principles of Marketing. Ed. 18th Essex: Pearson, 2021. Text.

Turabian Style

Kotler, Philip, Armstrong, Gary. Principles of Marketing. Ed. 18th Essex: Pearson, 2021. Print.