Stephen R. Covey  <br/><br/>
Principle centered leadership / 
Covey  R.S. 
 - New York :  Afireside book ;  1991. 
 - 334p. : 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0671792806 
<br/><br/><label>LC Class. No.: </label>BF 637  / .S8C67 1991