1. Sorrell S. Reducing energy demand: a review of issues, challenges and approaches. 1st ed.; 2015. p. 74–82. Renewable and Sustainable Energy Reviews. Retrieved from 〈http://ac.els-cdn.com/S1364032115001471/1-s2.0-S1364032115001471-main.pdf?_tid=cffc8bb4-4dcc-11e6-8d8d-00000aab0f01&acdnat=1468945454_e7ce1b26b2ef6fc761578a9ed626d445〉.
2. Pachauri R, Reisinger A, editors. Climate change 2007: synthesis report. Contribution of working groups I, II and III to the fourth assessment report of the intergovernmental panel on climate change. Geneva, Switzerland: IPCC; 2007.
3. Models and tools. (n.d.). Retrieved June 15 2016, from 〈http://www.nrel.gov/analysis/models_tools.html〉.
4. Difference between simulation and optimization – research papers – 1556 words. StudyMode. N.p., n.d. Web; 16 June 2016.
5. Gifford JS, Grace RC, Rickerson WH. Renewable energy cost modeling: a toolkit for establishing cost-based incentives in the united states [PDF]. U.S. Department of Energy; May 2011.