Kremer, J. (1992). The complete direct marketing sourcebook: A step-by-step guide to organizing and managing a successful direct marketing program (rev. ed.). Wiley.
Chicago-Zitierstil (17. Ausg.)Kremer, John. The Complete Direct Marketing Sourcebook: A Step-by-step Guide to Organizing and Managing a Successful Direct Marketing Program. rev. ed. New York u.a: Wiley, 1992.
MLA-Zitierstil (9. Ausg.)Kremer, John. The Complete Direct Marketing Sourcebook: A Step-by-step Guide to Organizing and Managing a Successful Direct Marketing Program. rev. ed. Wiley, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.