"William E. Hopke" <br/><br/>
The Encyclopedia of Career and Vocational Guidance - Vol. 1 

 - USA  J. G. Ferguson,,J. G. Ferguson Publishing Company  1993 
 - 530 
<br/><br/><label>ISBN: </label>0894341499 
<br/><br/><label>Dewey Class. No.: </label>030  / 942