1. Ground‐source heat pumps: overview of market status, barriers to adoption, and options for overcoming barriers;Goetzler,2009
2. Shallow systems: geothermal heat pumps;Rybach,2012
3. D.Lgs. 28 3 marzo 2011 Attuazione della direttiva 2009/28/CE sulla promozione dell’uso dell’energia da fonti rinnovabili, recante modifica e successiva abrogazione delle direttive 2001/77/CE e 2003/30/CE.
4. International Panel for Climate Change (IPCC) Working Group III – Special Report on Renewable Energy) – Chapter 4-Geothermal Energy.
5. European Geothermal Energy Council – EGEC Geothermal Market Report 2014.