1. http://www.ens.dk/graphics/Publikationer/Statistik_UK/Energy_statics_2006/html/ [chapter03.htm].
2. A visionary Danish energy policy 2025. .
3. IEA Wind Energy: Annual Report 2008, International Energy Agency, July 2009.
4. Wind Energy in Germany, Germany WindEnergy Association. .
5. 20% Wind Energy by 2030: Increasing Wind Energys Contribution to US Electricity Supply, Office of Energy Efficiency and Renewable Energy, Tech. Rep. DOE/GO-102008-2567, 2009. [July 2008].