Seth Godin: Permission Marketing : Turning Strangers Into Friends And Friends Into Customers
Daniel J. Polito: The Direct Marketing Cookbook : A Recipe for Getting and Keeping Customers
Roddy Mullin: Direct Marketing: A Step by Step Guide to Effective Planning and Targeting (Marketing in Action)
Arthur M. Hughes: Strategic Database Marketing: The Masterplan for Starting and Managing a Profitable Customer-Based Marketing Program
Lisa S. Spiller: Contemporary Direct Marketing