Covey, Stephen R. <br/><br/>
Principle-centered leadership / 
Stephen R. Covey. 
 - London :   Simon & Schuster,  c1992. 
 - 334 p. :  24 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0671749102 0671792806 
<br/><br/><label>LC Class. No.: </label>BF637.S8C  / C67 1990