APA استشهاد

Etzel, M. J., & Walker, B. J. S. (2001). Marketing (12th ed.). McGraw-Hill.

استشهاد بنمط شيكاغو

Etzel, Michael J., و Bruce J. Stanton Walker. Marketing. 12th ed. Boston: McGraw-Hill, 2001.

MLA استشهاد

Etzel, Michael J., و Bruce J. Stanton Walker. Marketing. 12th ed. McGraw-Hill, 2001.