Pihl, S. & Rose, P. M. (red.) (1995).
Geese. I
IWRB Publication (s. 59-77). International Waterfowl and Wetlands Research Bureau.
Madsen, J. & Kørvel, H. (red.) (1999).
Gæs. I H. Kørvel (red.),
Gyldendals Jagthåndbog (s. 269-273). Gyldendalske Boghandel.
Fox, A. D., Wernham, C. V. (red.), Toms, M. P. (red.), Marchant, J. H. (red.), Clark, J. A. (red.), Siriwardena, G. M. (red.) & Baillie, S. R. (red.) (2002).
Gadwall Anas strepera. I C. V. Wernham, M. P. Toms, J. H. Marchant, J. A. Clark, G. M. Siriwardena & S. R. Baillie (red.),
The Migration Atlas: Movements of the Birds of Britain and Ireland (s. 186-188). Bloomsbury Academic.
Fox, A. D., Vinogradov, V. G., Tucker, G. M. (red.), Heath, M. F. (red.), Tomialojc, L. (red.) & Grimmett, R. F. A. (red.) (1994).
Gadwall (Anas strepera). I
Birdlife Conservation Series (s. 120-121). Birdlife International.
Fox, A. D., Gibbons, D. W. (red.), Reid, J. B. (red.) & Chapman, R. A. (red.) (1993).
Gadwall. I D. W. Gibbons, J. B. Reid & R. A. Chapman (red.),
The New Atlas of Breeding Birds in Britain and Ireland 1988-1991 (s. 68-69). Poyser.
Fox, A. D. (2007).
Gadwall. I 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 (red.),
The Birds of Scotland (s. 191-194). Aberlady: Scottish Ornithologists' Club.
