Cram, Tony. Customers that count : how to build living relationships with your most valuable customers / by Tony, Cram. - 1st ed. - London : Prentice Hall, 2001. - viii, 261 p. ; 24 cm. ISBN: 0273654314 (hbk.) 9780273654315 (hbk.) Dewey Class. No.: 658.812 / CRA