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2. United Nations Report. World Urbanization Prospects: The 2014 Revisionhttps://esa.un.org/unpd/wup/publications/files/wup2014-highlights.pdf
3. EC–DG for Research. External Costs—Research Results on Socio-Environmental Damages Due to Electricity and Transporthttp://www.externe.info/externe_2006/externpr.pdf
4. Environmental External Costs of Transport,2001
5. Handbook on Estimation of the External Cost in the Transport Sector. Internalization Measures and Policies for All External Cost of Transport (IMPACT);Maibach,2008