Jones, D.A. (1991), "Electrical engineering: the backbone of society", Proceedings of the IEE: Science, Measurement and Technology, 138 (1): 1–10, doi:10.1049/ip-a-3.1991.0001, ISSN0960-7641
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Danish Ministry of Environment and Energy, "F.2 The Heat Supply Act", Denmark's Second National Communication on Climate Change, คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 2008-01-08, สืบค้นเมื่อ 2007-12-09
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Jones, D.A. (1991), "Electrical engineering: the backbone of society", Proceedings of the IEE: Science, Measurement and Technology, 138 (1): 1–10, doi:10.1049/ip-a-3.1991.0001, ISSN0960-7641