GOWANS, Billie; ROBERTSON, Gregory J; COOKE, Fred. Behaviour and chronology of pair formation by Harlequin Ducks Histrionicus histrionicus. Wildfowl, [S. l.], v. 48, p. 135–146, 1997. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154109. Acesso em: 3 apr. 2026.