WILSON, Robert E; VALQUI, Thomas H; MCCRACKEN, Kevin G. Aberrant plumage in the Yellow-billed Pintail Anas georgica. Wildfowl, [S. l.], p. 192–196, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/153958. Acesso em: 17 dec. 2025.