Weitz B A <br/><br/>
Selling: Building partnerships 
Weitz B A; Castleberry S B And Others 
 - New  New, york McGraw-Hill  2007 
 - 500p 
<br/><br/><label>ISBN: </label>0-07-313690-5 
<br/><br/><label>Source: </label>Textbook