Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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