In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( editors ): Handbook of Birds of the World, Volume 2 ( New World vultures to Guineafowl ): 259-260, plates 26.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: Del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( editors ): Handbook of Birds of the World, Volume 1: Ostrich to Ducks: 536 – 629.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( editors ): Handbook of Birds of the World, Volume 1: Ostrich to Ducks: 536 – 629.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( editors ): Handbook of Birds of the World, Volume 3: Hoatzin to Auks: 604-605, plate 50.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( editors ): Handbook of Birds of the World, Volume 2: New World Vultures to Guineafowl: 485, plate 43.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( editors ): Handbook of Birds of the World, Volume 2 ( New World Vultures to Guineafowl ): 267-268, plate 27.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
In: del Hoyo, Josep ; Elliott, Andrew & Sargatal, Jordi ( eds.
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