Encyclopedia of world problems and human potential / 
edited by Union of International Associations 
 - 3rd ed. 
 - Munchen :  K.G. Saur,  1991 
 - 2 v. :  ill. ;  31 cm. 
<br/><br/><label>ISBN: </label>3598108427 
<br/><br/><label>Subjects--Topical Terms: </label><br/>International agencies--Periodicals<br/>Social problems--Periodicals<br/>Civilization, Modern--20th century--Periodicals