McCarthy, William E. <br/><br/>
Gorillas in Captivity. 

 - Chicago-US :   Field Museum of Natural History,   1977. 
 - páginas 7-9 :   ilustraciones full color 
 - Mensual 
 - Vol.48, no.8(Sep. 1977) 
 - Field museum of Natural History Bulletin ;   no.8 .
 - Field Museum of Natural History. .