2008 policy brief by the Rappaport Institute and Taubman Center on carbon dioxide emissions across metropolitan and suburban areas in the United States.
2010 study from the Transit Cooperative Research Program on recent streetcar systems and their impact on development and land-use patterns.
2010 report by the American Public Health Association examining the external costs that automotive-transportation systems impose.
2007 meta-analysis by Amsterdam University of U.S. and international studies on transit stations' effect on property values.
2009 review by the World Bank of methods available for addressing transportation-sector emissions and congestion.