APA Style

Kotler, Philip, Armstrong, Gary. (2014). Principles of Marketing 15th ed. (15th ed.). USA: Pearson.

Chicago Style

Kotler, Philip, Armstrong, Gary. Principles of Marketing 15th ed.. 15th ed. USA: Pearson, 2014. Text.

MLA Style

Kotler, Philip, Armstrong, Gary. Principles of Marketing 15th ed.. 15th ed. USA: Pearson, 2014. Text.

Turabian Style

Kotler, Philip, Armstrong, Gary. Principles of Marketing 15th ed.. 15th ed. USA: Pearson, 2014. Print.