| | <http://pvcdrom.pveducation.org/index.html>. |
| | <http://pvcdrom.pveducation.org/index.html>. |
| | <http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/>. |
| | <http://solar.calfinder.com/blog/going/solar-thermal-vs-solar-pv/>. |
| | <http://www1.eere.energy.gov/solar/photovoltaics.html>. |
| | <http://www.apricus.com/html/evacuated_tubes.htm>. |
| | <http://www.apricus.com/html/solar_collector_efficiency.htm>. |
| | <http://www.azsolarcenter.com/technology/electric.html>. |
| | <http://www.bateswhite.com/news/pdf/07012008_BusinessMoney.pdf>. |
| | |
| | <http://www.costhelper.com/cost/home-garden/solar-panels.html>. |
| | <http://www.findsolar.com/>. |
| | <http://www.nrel.gov/learning/re_photovoltaics.html>. |
| | <http://www.nrel.gov/learning/re_solar_hot_water.html>. |
| | <http://www.solarbuzz.com/>. |
| | <http://www.solar-thermal.com/solar_vs_pv.html>. |
| | <http://www.southface.org/solar/index.htm>. |
| | <http://www.southface.org/solar/solar-roadmap/solar_how-to/solar- |
| | how_solar_works.htm>. |
| | Mills, David. Technical and economical system comparison of photovoltaic |
| | and concentrating solar thermal power systems depending on annual |
| | global irradiance. Tech. Elsevier Ltd., 2004. |
| | Photovoltaics. Wikipedia. <http://en.wikipedia.org/wiki/Photovoltaics>. |
| | "United States Weather." <http://countrystudies.us/united- |
| | states/weather/>. |