1. Foreword: Signposts to Sustainability;Toepfer,2002
2. http://www.awea.org/newsroom/releases/wind_energy_growth2008_27Jan09.html/
3. http://www.gwec.net/index.php?id=30&no_cache=1&tx_ttnews[tt_news]=177&tx_ttnews[backPid]=4&cHash=04fdc8c00a/
4. Leads World in Wind-Power Growthhttp://news.nationalgeographic.com/news/2008/04/080421-wind-power.html/
5. Annual Report on U.S. Wind Power Installation, Cost, and Performance Trends: 2006;Wiser,2007