1. ‘The EU's target for renewable energy: 20% by 2020’. Volume I: Report Authority of the House of Lords 24/10/2008
2. http://www.renewableuk.com/page/WindTurbines accessed 19 September 2016
3. http://www.renewableuk.com/page/Aviation accessed 19 September 2016
4. https://www.gov.uk/onshore‐wind‐part‐of‐the‐uks‐energy‐mix#wind‐turbines‐aviation‐and‐radar accessed 19 September 2016