Harden, Leland. <br/><br/>
Marketing by the numbers :  how to measure and improve the ROI of any campaign /  [electronic resource] 
Leland Harden and Bob Heyman. 
 - New York :  Amacom-American Management Association,  2010. 
 - p. cm. 
<br/><br/><label>ISBN: </label>9780814416204 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet marketing--Case studies.<br/>Internet marketing.
<br/><br/><label>LC Class. No.: </label>HF5415.1265  / .H3665 2010 
<br/><br/><label>Dewey Class. No.: </label>658.8/02