1. FAO: Future trends in energy, climate and woodfuel use. 2012.
http://www.fao.org/docrep/013/i1756e/i1756e05.pdf
2. Helmers E: Bewertung der Umwelteffizienz moderner Autoantriebe – auf dem Weg vom Diesel-PKW-Boom zu Elektroautos. Umweltmed Schadst Forsch 2010, 22: 564–578. 10.1007/s12302-010-0158-x
3. IPCC: Fourth assessment report. Transport and its infrastructure. Chapters 5.2.1, 5.3.1.2, and 5.3.1.3. 2001.
http://www.ipcc.ch/pdf/assessment-report/ar4/wg3/ar4-wg3-chapter5.pdf
4. Ward D: Global trends 2020 and beyond. Automobile use, environmental & safety challenges. 2011.
http://www.acea.be/images/uploads/files/presentation_ward.pdf
5. ACEA: The automobile industry pocket guide 2012. 2012.
http://www.acea.be/images/uploads/files/ACEA_POCKET_GUIDE_2012_UPDATED.pdf