1. Environmental Integration and the CAP;Baldock,2002
2. Barlow, M., 1940. Report of the Royal Commission on the Distribution of the Industrial Population, Cmd 6153, HMSO, London.
3. Body, S.R., 1982. Agriculture: The Triumph and the Shame. Avebury, UK.
4. Bowers, R., Cheshire, P., 1983. Agriculture, the Countryside and Land Use. Methuen.
5. British Geological Survey, 2008, Research reports on aggregate minerals in England. http://www.bgs.ac.uk/mineralsuk/free_downloads/home.html#aggregates.