Michael. E porter <br/><br/>
Competitive strategy   eng 
Michael E porter 
 - New York:  Free press;  1998 
 - xxviii,396p.;  ill.;  23cm 
<br/><br/><label>ISBN: </label>0743260880 
<br/><br/><label>Dewey Class. No.: </label>658.4012  / POR