1. BP statistical review of world energy June 2013;BP,2013
2. Energy conservation and emission reduction regulation and plan in 12th five-year plan;China State Council,2011
3. Energy development regulation and plan in 12th five-year plan;China State Council,2013
4. Chinese State Council plan to restrict China energy consumption;Chinese State Council,2013
5. World energy outlook 2013;International Energy Agency (IEA),2013