Wiles, Jon. <br/><br/>
Supervision : A guide to practice / 
Jon Wiles 
 - 3rd ed. 
 - New York :  Macmillan,  1991 
 - 379 p. :  ill. 
<br/><br/><label>ISBN: </label>0024276359 
<br/><br/><label>Subjects--Topical Terms: </label><br/>School supervision.
<br/><br/><label>LC Class. No.: </label>LB2806.4  / W55