The Development of educationwithin 1989-1990 :  report for the international bureau of education in Geneva 

 - Warsaw :  Ministry ofNational Education,  1990. 
 - 100 p. 
<br/><br/> International conference on education 42nd session 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>37 (438) =20 "1989-1990" DEV