- Cameroon – Electricity (International Trade Administration) www.trade.gov
- IREC – Interstate Renewable Energy Council www.irecusa.org
- National Renewable Energy Laboratory (NREL) www.nrel.gov
- National Renewable Energy Laboratory (NREL) – Solar Energy Basics www.nrel.gov
- Solar Energy Industries Association (SEIA) www.seia.org
- Solar Energy International (SEI) www.solarenergy.org
