"William E.Hopke" <br/><br/>
Encyclopedia of Careers & Vocational Guidance 

 - Chicago  J.G.Ferguson  Publishing  Company  1993 
 - 706 
<br/><br/><label>ISBN: </label>0-89434-149-9 
<br/><br/><label>Dewey Class. No.: </label>030  / 266