Citation
Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Bashford, R.I., Beaven, L.P., Freeman, S.N., Marchant, J.H., Noble, D.G., Raven, M.J., Siriwardena, G.M., Thewlis, R and Wernham, C.V. 2001. Breeding Birds in the Wider Countryside: their conservation status 2000. British Trust for Ornithology, Thetford, Norfolk
