Lloyd, Trevor. <br/><br/>
The mackenzie waterway a northern supply route. 

 - New York-US :   Geografical record,   1943. 
 - páginas 415-434 :   Ilustraciones blanco y negro 
 - Irregular 
 - Vol. XXXIII, no. 3(Jul. 1943) 
 - The Geographical Review ;   no. 3 .
 - The Geographical Review. .