1. International Energy Agency (IEA, 2019). IEA @ COP25. Available at: https://www.iea.org/reports/iea-cop25 Accessed on: 10.01.2020
2. Von der Leyen (2019). The European Green Deal: EU’s Response to Climate Change. European External Action Service. Available at: https://eeas.europa.eu/headquarters/headquarters-homepage/72184/european-green-deal-eus-response-climate-change_en Accessed on: 10.01.2020
3. European Commission (2018). The Energy Efficiency Directive (2012/27/EU) and The Amending Directive (2018/2002). Available at: https://ec.europa.eu/energy/en/topics/energy-efficiency/targets-directive-and-rules/energy-efficiency-directive#content-heading-0 Accessed on: 05.01.2020
4. International Energy Agency (IEA). (2007). Tracking Industrial, Energy Efficiency and CO2 Emissions. Available at: http://www.iea.org/textbase/nppdf/free/2007/tracking_emissions.pdf. Accessed on: 05.01.2020
5. World Energy Outlook 2012, World energy outlook special report;International Energy Agency (IEA),2012