JACKSON, E E; OGILVIE, M A; OWEN, M. The Wildfowl Trust expedition to Spitsbergen, 1973. Wildfowl, [S. l.], p. 102–116, 1974. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155890. Acesso em: 13 feb. 2026.