1. British Airports Authority 2011 News release, 24 March 2011. http://www.baa.com
2. Farmers Weekly 2011 £100m: the huge cost of Britain's worst winter, 4 March 2011. http://www.fwi.co.uk/Home/
3. House of Commons 2011 Keeping the UK moving: the impact on transport of the winter weather in December 2010, Transport Committee Report, 12 May 2011. http://www.publications.parliament.uk/pa/cm201012/cmselect/cmtran/794/79402.htm
4. Central England temperatures: monthly means 1659 to 1973.;Manley;Q. J. R. Meteorol. Soc.,1974