GRENQVIST, P. Some Diving Notes on Young Tufted Ducks, Young Velvet Scoters and Young Eider Ducks. Ornis Fennica, [S. l.], v. 13, n. 1, p. 6–23, 1936. Disponível em: https://ornisfennica.journal.fi/article/view/132337. Acesso em: 18 may. 2024.