Citation
Newson, S.E., Leech, D.I., Hewson, C.M., Crick, H.Q.P. & Grice, P.V. 2009. Population impact of grey squirrels Sciurus carolinensis on woodland bird populations in England. Journal of Ornithology 151: 218. doi:10.1007/s10336-009-0445-8
