1. UN Habitat, Global housing demand at critical levels, Available from: http://www.unhabitat.org/, accessed 8.10.12.
2. Annual Energy Review, U.S. Energy Information Administration,2011
3. Eurostat Main Indicators – Energy Statistics,2010
4. Australian Bureau of Statistics (ABS), Available from: http://www.abs.gov.au/ausstats/, (accessed 12.08.12).
5. Residential and commercial buildings;Levine,2007