UNESCO yearbook on peace and conflict studies, 1981. 

 - Paris : UNESCO; USA: Greenwood Press, 1982. 
 - xiii, 396 p. 
<br/><br/><label>ISBN: </label>0313229236 (Greenwood Press) 92-3-102032-3 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>OC 058: 355.014 (100)=20 "1981" UNE.