LIMPERT, Roland J; ALLEN, Hubert A, Jr; SLADEN, William J L. Weights and measurements of wintering Tundra Swans. Wildfowl, [S. l.], p. 108–113, 1987. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154802. Acesso em: 13 feb. 2026.