Whittlesey, Derwent. <br/><br/>
Dakar and the other cape verde settlements. 

 - New York-US :   Geografical record,   1941. 
 - páginas 609-638 :   Ilustraciones blanco y negro 
 - Irregular 
 - Vol. XXXI, no. 4(Oct. 1941) 
 - The Geographical Review ;   no. 4 .
 - The Geographical Review. .