Fox, A. D., Walsh, A. J., Norriss, D. W., Wilson, H. J., Stroud, D. A., Francis, I. S., Boere, G. C. (Ed.), Galbraith, C. A. (Ed.) & Stroud, D. A. (Ed.) (2007).
Twenty-five years of population monitoring - the rise and fall of the Greenland White-fronted Goose Anser albifrons flavirostris. 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 (pp. 637-639). Edinburgh Stationery Office.
http://www.jncc.gov.uk/PDF/pub07_waterbirds_part5.1.10.pdf