1. Adams, N., Ash, D., 2007. Corn Bunting Miliaria calandra Survey of Defence Training Estate Winter 2005/06. Unpublished report, RSPB, Sandy & Defence Estates.
2. Barthram, G.T., 1985. Experimental techniques: the HFRO sward stick. Hill Farming Research Organisation Biennial Report 1984-85, 9-30.
3. Within-field habitat selection by wintering skylarks Alauda arvensis in southwest England;Buckingham,2001
4. Buckingham, D.L., 2010. Grass silage as a new source of winter food for declining farmland birds. Report to Defra on Project BD1455. Defra, London, UK.
5. Use of set-aside land in winter by declining farmland bird species in the UK;Buckingham;Bird Study,1999