GOWANS, Billie; ROBERTSON, Gregory J; COOKE, Fred. Behaviour and chronology of pair formation by Harlequin Ducks Histrionicus histrionicus. Wildfowl, [S. l.], p. 135–146, 1997. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154109. Acesso em: 17 dec. 2025.