1. European Commission, 2009. Directive on the Promotion of the Use of Energy From Renewable Sources and Amending and Subsequently Repealing Directives 2001/77/EC and 2003/30/EC. European Commission, 2009/28/EC.
2. Renewable Energy: Analysis of the Latest Data on Energy From Renewable Sources,2012
3. IEA, Beerepoot, M., Marmion, A., 2012. Policies for Renewable Heat: An Integrated Approach, Paris, International Energy Agency.
4. Special Report on Renewable Energy Sources and Climate Change Mitigation: Policy, Financing and Implementation,2011