1. International Energy Agency: Energy Information Administration, Annual Energy Review, Paris, France, 2005.
2. Department of Energy (DOE): International Energy Outlook 2006, Report: DOE/EIA-0484(2006), Release Date: June 2006.
3. Department of Energy (DOE): Residential Energy Consumption Survey, USA, 2001.
4. Clinch: fuel poverty, thermal comfort and occupancy: results of a national household-survey in Ireland;Healy;Applied Energy,2002
5. English House Condition Survey: Follow Up Survey, DTI and DEFRA, 2001.