(PDF). [2013-04-25]. (原始内容存档 (PDF)于2013-02-02). A Review and Comparative Analysis of Fiscal Policies Associated with New Passenger Vehicle CO2 Emissions
Dioxide Emissions from Fossil-Fuel Combustion and Cement Manufacture Posted on CDIAC Site. Carbon Dioxide Information Analysis Center. [2012-05-15]. (原始内容存档于2012-05-08)