Thorthwaite, C.W. <br/><br/>
Problelms in the classification of climates. 

 - New York-US :   Geografical record,   1943. 
 - páginas 233-255 :   Ilustraciones blanco y negro 
 - Irregular 
 - Vol. XXXIII, no. 2(Apr. 1943) 
 - The Geographical Review ;   no. 2 .
 - The Geographical Review. .