1. L.D. Shorrock, J.H.F. Brown, ‘Domestic Energy Fact File’, Building, Research Establishment, Rep BG251, 1993, ISBN 0-85125-597-3.
2. Scottish Homes, ‘Scottish House Condition Survey’ ISBN 1874170142, 1997 (Currently being updated for 2002).
3. EU, ‘On the Energy Performance of Buildings’, Directive 2002/91/EC of the European Parliament, Off. J. Eur. Commun. December 2002.
4. ESRU, ‘Policy Support for the Thermal Improvements of Existing Dwellings’, Final Report to the Scottish Executive Development Department (Building Standards), ESRU, University of Strathclyde, April 2002.
5. EPIQR, www.hoki.ibp.fhg.de/ipb/software/epiqr/epiqr.html, 2003.