What kind of world are we leaving our children?. 

 - Paris :  UNESCO,  1978. 
 - 176 p. 
 - World tribune ;  1 .
<br/><br/><label>ISBN: </label>9231016237 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>308 -053.2 (100) =20 QUE.