GILLMOR, Robert; BLURTON JONES, N G. Observations on gathering and departure of Pink-footed Geese at Asgard in central Iceland. Wildfowl, [S. l.], p. 17, 1954. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155490. Acesso em: 13 feb. 2026.