Fronius USA LLC. Fronius Inverter Product Data. Brighton, MI: Fronius USA LLC, 2009. Fronius IG Plus Inverter Product Data. Fronius USA LLC, 2009. Web. Apr. 2010. <http://www.fronius.com/cps/rde/xchg/SID-2E06CBDE-5BC97634/fronius_usa/hs.xsl/2714_1483.htm>.
High Concrete Group. High Concrete - Technical Data. High Concrete Group, 2007. Web. Apr. 2010. <http://www.highconcrete.com/hcs/resources/info/technicaldata/>.
National Renewable Energy Laboratory. "NREL: Renewable Resource Data Center - PVWattts." PV Watts - Renewable Resource Data Center. National Renewable Energy Laboratory, 5 Feb. 2010. Web. 27 Apr. 2010. <http://www.nrel.gov/rredc/pvwatts/>.
Uni-Solar Photovoltaic Solutions. Uni-Solar PVL-144 Solar Laminate PVL-Panels. Rochester Hills, MI: Uni-Solar Photovoltaic Solutions, 2009. Uni-Solar Technical Data. United Solar Ovonic LLC, 2009. Web. Apr. 2010. <http://www.uni-solar.com/uploadedFiles/PVL-144EN(AA5-3636-03).pdf>.
Waier, Phillip R. Building Construction Cost Data 2010. Kingston, MA: R.S. Means, 2009. Print.
Waier, Phillip R. RSMeans Building Construction Cost Data 2009. Kingston, MA: R.S. Means, 2008. Print.