Field museum of Natural History Bulletin ;   no.9 

 - Chicago-US :   Field Museum of Natural History,   1980. 
 - páginas 24-27 :   ilustraciones full color 
 - Mensual 
 - Vol.51, no.9 (Oct. 1980) 
 - Field museum of Natural History Bulletin ;   no.9 .
 - Field Museum of Natural History. .