Physornis (Dutch Wikipedia)

Analysis of information sources in references of the Wikipedia article "Physornis" in Dutch language version.

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biodiversitylibrary.org

Ameghino, F. (1895). Sobre las aves fósiles de Patagonia. Boletin del Instituto Geografico da Argentina 15: 501–602 (in verzameld werk, deel 11 (1920): 325 (es) )
Patterson, B. (1941). A new phororhacoid bird from the Deseado formation of Patagonia. Field Museum of Natural History, Geological Series 8(8): 49-54

Alvarenga, Herculano M.F. & Höfling, Elizabeth (2003). Systematic revision of the Phorusrhacidae (Aves: Ralliformes). Papéis Avulsos de Zoologia (São Paulo) 43(4): 55–91