Dessler, Gary. <br/><br/>
Supervision and Leadership in a changing World / 
Gary Dessler. 
 - New york  Prentice Hall  2012 
 - xxiii, 577 p. :  ill. col.;  25 cm. 
<br/><br/><label>ISBN: </label>9780135058657 
<br/><br/><label>Dewey Class. No.: </label>658.4092/  / DES