Covey, Stephen R <br/><br/>
Principle centred leadership 
Stephen R. Covey. 
 - London  Simon and Schuster  1991 
 - 332p., 24cm. 
<br/><br/><label>ISBN: </label>0-684-85841-x. 
<br/><br/><label>Dewey Class. No.: </label>658.4092  / C66P