1. Building-Integrated Photovoltaics (BIPV) in the Residential Sector: An Analysis of Installed Rooftop System Prices;James,2011
2. World Passes 100 GW Installed PV Capacity Markhttp://www.pv-magazine.com/news/details/beitrag/world-passes-100-gw-installed-pv-capacity-mark_100010145/#axzz2WGhwHqSz
3. Germany Added Record Solar Panels in 2012 Even as Subsidies Cuthttp://www.bloomberg.com/news/2013-01-07/germany-added-record-solar-panels-in-2012-even-as-subsidies-cut.html
4. The Top Solar Countries—Past, Present and Futurehttp://reneweconomy.com.au/2013/the-top-solar-countries-past-present-and-future-96405
5. Photovoltaik ist mit 30 Gigawatt stärkste Stromerzeugungstechnik in Deutschland (Photovoltaics is with 30 Gigawatts most powerful Electricity Production Technology in Germany)http://www.ise.fraunhofer.de/de/aktuelles/meldungen-2012/photovoltaik-ist-mit-30-gigawatt-staerkste-stromerzeugungstechnik-in-deutschland