Greenberg, Paul. CRM at the speed of light : essential customer strategies for the 21st century / by Paul Greenberg. - 3rd ed. - New York : McGraw Hill, 2009. - xviii, 670 p. : ill. ; 25 cm. Includes bibliographical references index. ISBN: 9780070590571 (pbk.) Subjects--Topical Terms: Customer relations--Management.Electronic commerce. Dewey Class. No.: 658.812 / GRE/C