Secondary school kit on the united nations / 
edit. by David Barrs, Maura Juffkins. 
 - Nueva York :  UNA-UK,  1995. 
 - 83 p. :  map. 
<br/><br/><label>ISBN: </label>1857492072 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>341.123: 373.5 (100)=20 "1995" MAT.