Citation
Austin, G.A., Rehfisch, M.M., Allan, J.R. & Holloway, S.J. 2007. Population size and differential population growth of introduced Greater Canada Geese Branta canadensis and re-established Greylag Geese Anser anser across habitats in Great Britain in the year 2000. Bird Study 54: 352. doi:10.1080/00063650709461494