1. Landscape Changes in Britain;Barr,1986
2. Barr, C.J., Bunce, R.G.H., Clarke, R.T., Fuller, R.M., Furse, M.T., Gillespie, M.K., Groom, G.B., C.J., Hornung, M., Howard, D.C., Ness, M.J., 1993. Countryside Survey 1990: Main Report. Department of the Environment, London.
3. Farmland biodiversity: is habitat heterogeneity the key?;Benton;TREE,2003
4. ITE Merlewood land classification of Great Britain;Bunce;J. Biogeogr.,1996
5. Agricultural intensification and the collapse of Europe's farmland bird populations;Donald;Proc. R. Soc. Lond. B,2001