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

 - 2nd ed. 
 - New York  John Wiley and Sons, inc.  1957 
 - xiv, 349 p.; 22cm. 
<br/><br/> Wiley international edition 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Supervisors