Thomas, Wilbur K.,  <br/><br/>
News bulletin  ;   no.8 

 - New York-US :   The institute of international education,   1932. 
 - página 8 
 - Irregular 
 - Vol.VII, no.8 (May.1932) 
 - News bulletin  ;   no.8 .
 - The institute of international education. .