Rehfisch M.M., Allan J.R., Graham E. 2010. The effect on the environment of Great Britain’s naturalized Great Canada Branta canadensis and Egyptian Geese Alopochen aegyptiacus. In British Ornithologists’ Union Conference proceedings, The impacts of non-native species. 19 Novembre 2008. Peterborough, Royaume-Uni, 9 pp.

Rehfisch M.M., Allan J.R., Graham E. 2010. The effect on the environment of Great Britain’s naturalized Great Canada Branta canadensis and Egyptian Geese Alopochen aegyptiacus. In British Ornithologists’ Union Conference proceedings, The impacts of non-native species. 19 Novembre 2008. Peterborough, Royaume-Uni, 9 pp.