1. Decision No 406/2009/EC of the European Parliament and of the Council of 23 April 2009 on the Effort of Member States to Reduce Their Greenhouse Gas Emissions to Meet the Community’s Greenhouse Gas Emission Reduction Commitments up to 2020,2009
2. Statistics-Total Primary Energy Supply (PES) by Source
https://www.iea.org/statistics/?country=WORLD&year=2008&category=Key%20indicators&indicator=TPESbySource&mode=chart&categoryBrowse=false&dataTable=BALANCES&showDataTable=true
3. Statistics-Electricity Generation by Fuel
https://www.iea.org/statistics/?country=WORLD&year=2007&category=Key%20indicators&indicator=ElecGenByFuel&mode=chart&categoryBrowse=false&dataTable=ELECTRICITYANDHEAT&showDataTable=true
4. Coal 2017 Analysis and Forecasts to 2022—Executive Summary,2017
5. EU Energy in Figures—Statistical Pocketbook 2017,2017