1. Department of Alternative Energy Development and Efficiency, Ministry of Energy, The Renewable and Alternative Energy Development Plan for 25 Percent in 10 Years (AEDP 2012–2021). Bangkok: Department of Alternative Energy Development and Efficiency, Ministry of Energy; 2012.
2. Vashishtha S, Differentiate between the DNI, DHI and GHI. 〈http://firstgreenconsulting.wordpress.com/2012/04/26/differentiate-between-the-dni-dhi-and-ghi/〉 [accessed 30.08.14].
3. GeoModel Solar; World Map of Global Horizontal Irradiation. 〈http://solargis.info/doc/_pics/freemaps/1000px/ghi/SolarGIS-Solar-map-World-map-en.png〉 [accessed 31.08.14].
4. Open Energy Information, Solar Resources by Class per Country. 〈http://en.openei.org/datasets/node/498〉 [accessed 09.08.14].
5. The European Photovoltaic Industry Association (EPIA), Global market outlook for Photovoltaics 2014–2018, May 2014.