1. Wind Energy—The Facts: A Guide To The Technology, Economics And Future Of Wind Power,2009
2. http://www.gwec.net/fileadmin/documents/Global%20Wind%202008%20Report.pdf
3. http://www.environmentalleader.com/wp-content/uploads/2009/03/wind-turbine-market-share.jpg
4. http://www.wind-energie.de