1. Chinese New-Type Urbanization Report 2012;Niu,2012
2. DiDi Published Chinese Urban Transportation Report of 2016 First Half Yearhttp://www.chinairn.com/news/20160714/16425045.shtml
3. The green way to the development of Chinese urban transportation;Li;Urban Plan. Forum,2008
4. What Is Green Travel?http://env.people.com.cn/GB/178688/180057/10798248.html
5. CO2 Emissions from Fuel Combustion Highlightshttp://www.iea.org/publications/freepublications/publication/co2-emissions-from-fuel-combustion-highlights-2015.html