Economic aspects of special education :  Czechoslovakia, New Zealand, United States of America. 

 - París :  UNESCO,  1978. 
 - 152 p. :  fots. 
 - Special education .
<br/><br/><label>ISBN: </label>9231015141 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>376 =20 ASP