VAN DER WAL, Reinder J.; ZOMERDIJK, Piet J. The moulting of Tufted Duck and Pochard on the IJsselmeer in relation to moult concentrations in Europe. Wildfowl, [S. l.], p. 99–108, 1979. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154135. Acesso em: 18 dec. 2025.