Collar, N. J. <br/><br/>
Threatened birds of Africa and related islands/ 
N. J. Collar and S. N. Stuart. 
 - 3rd ed. 
 - Cambridge;  International Council for Bird Preservation,  1985. 
 - xxxiv, 761 p. : ill. ;   23 cm. 
<br/><br/>p. 723-730 
<br/><br/><label>ISBN: </label>2880326044 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Birds--Africa