HAWKINS, Penny A J; BUTLER, P J; WOAKES, A J. Growth and morphology of captive female Common Eider Somateria mollissima ducklings. Wildfowl, [S. l.], p. 92–102, 1998. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154606. Acesso em: 17 dec. 2025.