European co-operation on education :  activities of UNESCO, OECD, The Council of Europe, The European Commubity and The Nordic Council of Ministers / 
by Leo Leitner. 
 - Lisboa :  Council of Europe,  1981. 
 - 77 p. 
 - Working documents ;  MED-12-7 .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>DO 37.014 (06) (4) =20 "1981" EUR No.7.