Ward Vernon .A <br/><br/>
Resources for educational research and deelopment 

 - New York  NFER Publishing  Company Ltd .  1973 
 -  21. 6 
<br/><br/><label>ISBN: </label>85633 026 4 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>370.78