Robinson, J. A., Gudmundsson, G. A.
, Clausen, P., Boere, G. C. (Ed.), Galbraith, C. A. (Ed.) & Stroud, D. A. (Ed.) (2007).
Flyways of the East Canadian High Arctic Light-bellied Brent Goose Branta bernicla hrota: results of a satellite telemetry study. In G. C. Boere, C. A. Galbraith & D. A. Stroud (Eds.),
Waterbirds around the world: A global overview of the conservation, management and research of the world's waterbird flyways Edinburgh Stationery Office.
Fox, A. D. (2007).
Gadwall. In R. Forrester, I. J. Andrews, C. J. McInerny, R. D. Murray, R. Y. McGowan, B. Zonfrillo, M. W. Betts, D. C. Jardine & D. S. Grundy (Eds.),
The Birds of Scotland (pp. 191-194). Aberlady: Scottish Ornithologists' Club.