Gale B.t. <br/><br/>
Managing customer value : Creating Quality and Service that customer can see 
Gale B.t. 
 - New  New, york The free Press  1994 
 - 446p 
<br/><br/><label>ISBN: </label>0-02-911045-9 
<br/><br/><label>Source: </label>Textbook