Kohn, Hans. <br/><br/>
The international aspect of an adult education effort. 

 - New York-US :   The institute of international education,   1934. 
 - páginas 5-7 
 - Irregular 
 - Vol.9, no.5 (Feb.1934) 
 - News bulletin  ;   no.5 .
 - The institute of international education. .