APA

Kotler P., Armstrong G., . (2021). Principles of marketing. Harlow: Pearson.

Chicago

Kotler Philip, Armstrong Gary, . 2021. Principles of marketing. Harlow: Pearson.

Harvard

Kotler P., Armstrong G., . (2021). Principles of marketing. Harlow: Pearson.

MLA

Kotler Philip, Armstrong Gary, . Principles of marketing. Harlow: Pearson. 2021.