American Solar Energy Society (ASES) – http://www.ases.org/
California Energy Commission Consumer Energy Center – http://www.consumerenergycenter.org/
California Energy Commission Renewable Energy Program – http://www.energy.ca.gov/renewables/
Database of State Incentives for Renewables & Efficiency – http://www.dsireusa.org/
European Solar Thermal Industry Federation – http://www.ESTIF.org
Retail division of Heliodyne Delta-T control units – http://www.deltatcontrols.com
Solar Energy Industries Association (SEIA) – http://www.seia.org/
Solar Rating & Certification Corporation – http://www.solar-rating.org/
U.S. Department of Energy Energy Efficiency & Renewable Energy – http://www1.eere.energy.gov/solar/