1. United States Environmental Protection Agency, citing results from the Intergovernmental Panel on Climate Change (IPPC) (2014); link: https://www.epa.gov/ghgemissions/global-greenhouse-gas-emissions-data
2. International organization of Motor Vehicle Manufacturers, Paris, France (2013); link: http://www.oica.net/wp-content/uploads//total-inuse-2013.pdf
3. EEA report No 27/2016: Monitoring CO2 emissions from new passenger cars and vans 2015 (2016); http://europe.autonews.com/assets/PDF/CA1083161216.PDF
4. McKinsey BOOST! Study (2011); link: http://actions-incitatives.ifsttar.fr/fileadmin/uploads/recherches/geri/PFI_VE/pdf/McKinsey_boost.pdf
5. ZSW (Zentrum für Sonnenenergie und Wasserstoff-Forschung Baden-Württemberg) Presseinformation 05/2016 (2016); link: https://www.zsw-bw.de/fileadmin/user_upload/PDFs/Pressemitteilungen/2016/pi05-2016-ZSW-ZahlenElektromobilitaet_01.pdf