VRTISKA, Mark P.; DUBOVSKY, James A.; ANDERSON, Michael G. The North American Trumpeter Swan Survey: retain or find something new?. Wildfowl, [S. l.], p. 57–75, 2024. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/156352. Acesso em: 16 dec. 2025.