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  • "Ice keeps New York office towers cool", http://www.cnn.com/2007/TECH/science/07/24/ice.cooling.ap/index.html (10/11/07)
  • EPA. www.epa.gov (10/11/07)
  • Geo Heating www.geo-heating.com (10/11/07)
  • Geo Exchange www.geoexchange.org (10/11/07)
  • Earth Easy. "Cooling and heating use more energy than any other system in your home", http://www.eartheasy.com/live_naturalcooling.htm (10/11/07)