HARRISON, Jeffery G; OLNEY, P J S. Haemorrhage from an oesophageal diverticulum causing death in a wild Mallard. Wildfowl, [S. l.], p. 150–152, 1959. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/156148. Acesso em: 18 dec. 2025.