Some approaches to pre-school education :  a resource document. 

 - Paris :  New York :  Rome :  UNESCO;  UNICEF;  WFP,  1979. 
 - 19 p. 
 - Notes, Comments...;  8. .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>372.3 (100) =20 SOM No.8