Spriegel, William R., Schulz, Edward and Spriegel, William B. <br/><br/>
Elements of supervision 

 - 2nd ed. 
 - London  John Wiley & Sons  1957 
 - 341p. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education<br/>Supervision
<br/><br/><label>Dewey Class. No.: </label>370  / SPR