MATTHEWS, G V T; OGILVIE, M A; ATKINSON-WILLES, G L; GARVEY, P L; KING, R; EVANS, Mary; JOHNSTONE, S T; VARDY, P R; CAMPBELL, C R G. Research, Conservation and Education. Wildfowl, [S. l.], p. 125-, 1972. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154899. Acesso em: 17 dec. 2025.