Barlow Clive (1997): A field guide to birds of The Gambia and Senegal. Pica Press, Nr. Robertsbridge (East Sussex).ISBN 1-873403-32-1
ffrench Richard; O'Neill John Patton; Eckelberry Don R. (1991): A guide to the birds of Trinidad and Tobago (Ấn bản lần 2). Comstock Publishing, Ithaca, N.Y.ISBN 0-8014-9792-2
Gamauf Anita; Gjershaug Jan-Ove; Røv Nils; Kvaløy Kirsti; Haring Elisabeth (2005): Species or subspecies? The dilemma of taxonomic ranking of some South-East Asian hawk-eagles (genus Spizaetus). Bird Conservation International 15(1): 99–117.doi:10.1017/S0959270905000080 (Tóm tắt HTML)
Grimmett Richard; Inskipp Carol; Inskipp Tim; Byers Clive (1999): Birds of India, Pakistan, Nepal, Bangladesh, Bhutan, Sri Lanka, and the Maldives. Nhà in Đại học Princeton, Princeton, N.J..ISBN 0-691-04910-6
Hilty Steven L. (2003): Birds of Venezuela. Christopher Helm, London.ISBN 0-7136-6418-5
Stiles F. Gary; Skutch Alexander Frank (1989): A guide to the birds of Costa Rica. Comistock, Ithaca.ISBN 0-8014-9600-4
