1. CO2 Emissions from Fuel Combustion 2013
2. National Bureau of Statistics of China (NBSC) http://www.stats.gov.cn/tjsj/ndsj/2012/indexch.htm
3. World Energy Outlook 2013
4. National Transportation Statistics (NTS);United States Department of Transportation;United States Department of Transportation,2013
5. The Energy Conservation Center, Japan (TECC) http://www.asiaeec-col.eccj.or.jp/databook/2011/index.html