Madsen, J., Fox, A. D., Hagemeijer, W. J. M. (Ed.) & Blair, M. J. (Ed.) (1997). Pink-Footed Goose Anser brachyrhynchus. In W. J. M. Hagemeijer & M. J. Blair (Eds.), The EBCC Atlas of European Birds: their Distribution and Abundance (pp. 74). Poyser.
Fox, A. D., Stawarczyk, T., Hagemeijer, W. J. M. (Ed.) & Blair, M. J. (Ed.) (1997). Pochard Aythya ferina. In W. J. M. Hagemeijer & M. J. Blair (Eds.), The EBCC Atlas of European Birds: their Distribution and Abundance (pp. 102-103). Poyser.