Porter, Michael E.,  1947- <br/><br/>
Competitive strategy :  techniques for analyzing industries and competitors / 
Michael E. Porter 
 - New York :  Free Press,  1980 
 - 396 p. :  ill. ;  24 cm. 
<br/><br/>References : p. 383-387 
<br/><br/><label>ISBN: </label>0029253608 
<br/><br/><label>LCCN: </label>80-652 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Competition<br/>Industrial management