1. Renewables in Global Energy Supply: An IEA Fact Sheet,2007
2. International Energy Agencyhttp://www.iea.org/stats
3. UNECEhttp://www.unece.org/index.php?id=32790
4. The Strategy for the Forest Sector of the Russian Federation until 2020,2008
5. The Volume of Timber Harvested in 2009–2011,2012