1. Approved Inspectors Ltd., no date. What is an Approved Inspector? 〈http://www.approvedinspectorsltd.co.uk/newsletter/index.shtml?story=appins.1.1〉 (accessed: 11.12.10).
2. Bell, M., Smith, M., Palmer, J., 2010. Review of the Implementation of Part L 2006—BD 2702. Communities and Local Government, London.
3. Social Research Methods;Bryman,2008
4. Part L Explained–The BRE Guide, BRE 489;BRE,2006
5. The Government's Standard Assessment Procedure for Energy Rating of Dwellings;BRE,2009