Paynter, Raymond A. Jr, ed. (1970). Check-list of Birds of the World. Vol. 13. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 224.
hbw.com
Jobling, J.A. (2018). del Hoyo, J.; Elliott, A.; Sargatal, J.; Christie, D.A.; de Juana, E. (eds.). "Key to Scientific Names in Ornithology". Handbook of the Birds of the World Alive. Lynx Edicions. Retrieved 1 May 2018.