1. U.S. Department of Energy, Buildings Energy Data Book, 2007. http://buildingsdatabook.eren.doe.gov/.
2. B. Obama, New Energy for America, Presidential Election Speech, 2008. http://www.barackobama.com/pdf/factsheet_energy_speech_080308.pdf/.
3. City of New York, PlaNYC: A Greener, Greater New York, Mayor's Office of Operations Report, Office of Long-term Planning and Sustainability, April 2007. http://www.nyc.gov/html/planyc2030/downloads/pdf/full_report.pdf.
4. U.S. Green Building Council, LEED Rating Systems, 2008. http://www.usgbc.org/.
5. Energy conservation through product-integrated feedback;McCalley;Journal of Economic Psychology,2002