1. History of the diesel engine
2. MAN Energy Solutions SE. MAN Museum. Heinrich-von-Buz-Straße. 28 86153 Augsburg. Available from: www.museum.man-es.com; http://www.man.eu/man/media/en/content_medien/doc/global_corporate_website_1/unternehmen_1/broschuere_man_museum.pdf
3. 260 D: first production car with diesel engine. MarsClassic n.d. Available from: https://mercedes-benz-publicarchive.com/marsClassic/en/instance/ko/260-D-first-production-car-with-diesel-engine.xhtml?oid=4910058
4. European Automobile Manufacturers Association (ACEA). Medium and heavy trucks over 3.5 T new registrations by fuel type in the European union. Available from: ACEA_trucks_by_fuel_type_full-year_2019.pdf n.d.
5. European Automobile Manufacturers Association(ACEA). Light commercial vehicles (Up To 3.5t) new registrations by fuel type in the European union. Available from: ACEA_vans_by_fuel_type_full_year_2019.pdf n.d.