Husen, Torsten Postlethwaite, T. Neville <br/><br/>
THE INTERNATIONAL ENCYCLOPEDIA OF EDUCATION/  RESEARCH AND STUDIES 

 - England  Pergamon Press plc  1985 
 - 419p. 
<br/><br/><label>ISBN: </label>0-08-028119-2 
<br/><br/><label>LC Class. No.: </label>LB 15  / .I57 V.10 C.6