Instructional materials for developing information concepts and information-handling skills in schoolchildren :  an international study / 
edited by Ann Irving. 
 - Paris :  UNESCO,  1981. 
 - iii, 64 p. ;  il. 
 - PGI-81/WS/32 .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>371.64/. 69 (100)=20 1981INS No.32.