Porter, Michael E. <br/><br/>
Competitive advantage  creating and sustaining superior performance / 
Michael E. Porter 
 - New York  Free Press  1985 
 - 557p.  ill.  26cm. 
<br/><br/><label>ISBN: </label>0029250900 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Competition<br/>Industrial management