Spriegel, W.R. <br/><br/>
Elements of supervision 

 - 2nd ed. 
 - New York  John Wiley and Sons  1957 
 - xii. 349 
<br/><br/><label>Subjects--Index Terms: </label>Sopervision 
<br/><br/><label>Dewey Class. No.: </label>658.43 SPR  / SPR