1. European Commission. Direttiva 2012/27/UE del Parlamento Europeo e del Consiglio sull’efficienza energetica, che modifica le direttive 2009/125/CE e 2010/30/UE e abroga le direttive 2004/8/CE e 2006/32/CE, Bruxelles, European Commission; 2012.
2. Centre for Renewable Energy Sources (CRES). Energy audit guide, Athens, CRES; 2000.
3. Energy efficiency manual;Wulfinghoff,1999
4. Energy management and conservation handbook;Kreith,2008
5. Introduction to energy efficiency in museums, galleries, libraries and churches;Energy Efficiency Office (EEO),1994