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4. Fjeldså, J., and N. Krabbe (1990). Birds of the High Andes: A Manual to the Birds of the Temperate Zone of the Andes and Patagonia, South America. Zoological Museum, University of Copenhagen, and Apollo Books, Copenhagen and Svendborg, Denmark.
5. Meyer de Schauensee, R. (1970). A Guide to Birds of South America. Academy of Natural Sciences, Philadelphia, PA, USA.