Kilham, Lawrence <br/><br/>
Breeding and Other Habits of Casqued Hornbills (Bycanistes Subcylindricus) 

 - Washington :   Smithsonian Institution,   1956. 
 - 45 p. :   láms. ;   21 cm. 
 - Smithsonian Miscellaneous Colections ;   V. 131; Nº9 .