Furlong, C. B. (1993). Marketing for keeps: Building your business by retaining your customers. Wiley.
Chicago-Zitierstil (17. Ausg.)Furlong, Carla B. Marketing for Keeps: Building Your Business by Retaining Your Customers. New York u.a: Wiley, 1993.
MLA-Zitierstil (9. Ausg.)Furlong, Carla B. Marketing for Keeps: Building Your Business by Retaining Your Customers. Wiley, 1993.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.