• Amar, A., Hewson, C.M., Thewlis, R.M., Smith, K.W., Fuller, R.J., Lindsell, J.A., Conway, G., Butler, S. & MacDonald, M.A. 2006. What's Happening to Our Woodland Birds? Long-Term Changes in the Populations of Woodland Birds. BTO Research Report 169 & RSPB Research Report 19. Thetford: BTO and Sandy: RSPB.
  • Crick, H.Q.P., Dudley, C., Glue, D.E. & Thompson, D.L. 1997. UK birds are laying eggs earlier. Nature 388: 525527.
  • Crick, H.Q.P. & Sparks, T.H. 1999. Climate change related to egg-laying trends. Nature 399: 423434.
  • Defra. 2005. Sustainable Development – The Government's Approach.
  • Forestry Commission. 2003. National Inventory of Woodland and Trees. Edinburgh: Forestry Commission.
  • Freeman, S.N., Noble, D.G., Newson, S.E. & Baillie, S.R. 2007. Modelling population changes using data from different surveys: the Common Bird Census and Breeding Bird Survey. Bird Study 54: 6172.
  • Fuller, R.J., Noble, D.G., Smith, K.W. & Vanhinsbergh, D. 2005. Recent declines in populations of woodland birds in Britain: a review of possible causes. Br. Birds 98: 116143.
  • Gregory, R.D., Wilkinson, N.I., Noble, D.G., Robinson, J.A., Brown, A.F., Hughes, J., Proctor, D., Gibbons, D.W. & Galbraith, C.A. 2002. The population status of birds in the United Kingdom, Channel Islands and Isle of Man: an analysis of conservation concern. Br. Birds 95: 410450.
  • Littell, R.C., Milliken, G.A., Stroup, W.W. & Wolfinger, R.D. 1996. SAS System for Mixed Models. Cary, NC: SAS Institute Inc.
  • Marchant, J.H. 1983. BTO Common Birds Census Instructions. Tring: British Trust for Ornithology.
  • Marchant, J.H., Hudson, R., Carter, S.P. & Whittington, P. 1990. Population Trends in British Breeding Birds. Tring: British Trust for Ornithology.
  • Newson, S.E., Woodburn, R.J.W., Noble, D.G., Baillie, S.R. & Gregory, R.D. 2005. Evaluating the Breeding Bird Survey for producing national population size and density estimates. Bird Study 52: 4254.
  • SAS Institute Inc. 1999. SAS/STAT Users’ Guide, Version 8. Cary, NC: SAS Institute Inc.
  • Spencer, J.W. & Kirby, K.J. 1992. An inventory of ancient woodland for England and Wales. Biol. Conserv. 62: 7793.
  • Thewlis, R.M., Noble, D.J. & Fuller, R.J. 2003. Scoping Study of Woodland Common Birds Census Plots to Assess Suitability for a Planned Resurvey of Woodland Plots. Thetford: British Trust for Ornithology.