Duggan, Stephen P. <br/><br/>
The lecture system in american and european universities. 

 - New York-US :   The institute of international education,   1932. 
 - páginas 2-3 
 - Irregular 
 - Vol.VII, no.5 (Feb.1932) 
 - News bulletin  ;   no.5 .
 - The institute of international education. .