1. Bøeng, A.C., 2005. Energibruk i husholdninger 1930–2004 og forbruk etter husholdningstype, Statistics Norway, Oslo.
2. DGET, 2004. European Union Energy and Transport in Figures—part 2: Energy, Directorate-General for Energy and Transport.
3. ECBCS, 2004. Stock aggregation, in Annex 31—Energy related environmental impact of buildings, IEA-ECBCS (International Energy Agency–Energy Conservation in Buildings and Community Systems).
4. Eggen, G., 2005. NVE-Varmepumpens bidrag til redusert energibruk i Norge, Utredning gjennomført av COWI for NVE, datert 12.2005.
5. EN 15217, 2007. Energy performance of buildings—Methods for expressing energy performance and for energy certification of buildings, CEN.