Citation
Rehfisch, M.M, Austin, G.E., Holloway, S.J., Allan, J.R. & O'Connell, M. 2002. An approach to the assessment of change in the numbers of Canada Geese Branta canadensis and Greylag Geese Anser anser in southern Britain. Bird Study 49: 59. doi:10.1080/00063650209461244