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Gál, Erika; Hír, János; Kessler, Eugén; Kókay, József (1998–99). “Középsõ-miocén õsmaradványok, a Mátraszõlõs, Rákóczi-kápolna alatti útbevágásból. I. A Mátraszõlõs 1. lelõhely” [Middle Miocene fossils from the sections at the Rákóczi chapel at Mátraszőlős. Locality Mátraszõlõs I.] (PDF). Folia Historico Naturalia Musei Matraensis (bằng tiếng Hungary và English). 23: 33–78.Quản lý CS1: ngôn ngữ không rõ (liên kết)
Livezey, Bradley C. (1986). “A phylogenetic analysis of recent anseriform genera using morphological characters” (PDF). Auk. 103 (4): 737–754. JSTOR 4088089.
Madge, Steve; Burn, Hilary (1988). Waterfowl: An Identification Guide to the Ducks, Geese, and Swans of the World. Boston: Houghton Mifflin. tr. 274–276. ISBN 0-395-46727-6.
Mlíkovský, Jiří (2002). Cenozoic Birds of the World, Part 1: Europe (PDF). Prague: Ninox Press. tr. 123. Bản mẫu:Listed Invalid ISBN.

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