1. U.S. Department of Energy. Office of energy efficiency and renewable energy. Hist Wind Energy. Retrieved from: http://energy.gov/eere/wind/history-wind-energy.
2. Timeline: the history of wind power;The Guardian,2008
3. Aerodynamics of wind turbines;Hansen,2008
4. Global wind capacity increased almost 20% in 2012 to 282 gigawatts;Spross,2013
5. Global statistics;Global Wind Energy Council,2014