Line, William. <br/><br/>
Aptitude test and their application in wartime 

 - Toronto-CA :   Royal canadian institute,   1943. 
 - páginas 41-43:   Ilustraciones blanco y negro 
 - Irregular 
 - Vol. VIII, no.III (1942-1943) 
 - Proceedings of the Royal Canadian Institute ;   no.III .
 - Royal Canadian Institute. .