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^Gill, F & D Donsker (Eds). 2015. IOC World Bird List (v 5.1). doi : 10.14344/IOC.ML.5.1.
^Dickinson, E.C., J.V. Remsen Jr. & L. Christidis (Eds). 2013-2014. The Howard & Moore Complete Checklist of the Birds of the World. 4th. Edition, Vol. 1, 2, Aves Press, Eastbourne, U.K.