Taxonomy and identification of steamer-ducks (Anatidae : Tachyeres) - Livezey, Bradley C.; Humphrey, Philip Strong,; University of Kansas. Museum of Natural History. (Lawrence, Kan, Museum of Natural History, University of Kansas, 1992, 1992)
https://www.biodiversitylibrary.org/bibliography/8436
Keywords: Anatidae|Identification|South America|Steamer ducks|