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[1] Energy audit methodology (In Slovene “Metodologija izvedbe energetskega pregleda”), Ministry of environment and spatial planning, April 2007.
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[2] Guide for energy audit performers (In Slovene “Priročnik za izvajalce energetskih pregledov”), Ministry of economic development and technologies, Agency for efficient energy use, 1997.
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[3] Standard ISO 50001:2011, Energy management systems.
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[4] Guide for efficient energy use, Bayerisches Landesamt für Umweltschutz (LfU), Augsburg, 2004 – ISBN 3-936385-52-1.
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[5] Energy efficiency indicator, Institute for building efficiency an initiative of Johnson Controls Key performance indicators, 2013 Europe results.
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[6] CO-EFFICIENT project "Design of analytical tool and indicators in collaboration with companies ", WP5-Frame of reference for energy efficiency and use of renewable solutions in production and operations, February 2015.