Flat engine (English Wikipedia)

Nunney, M. J. (1988). Light and Heavy Vehicle Technology. Oxford, UK: Heinemann Professional Publishing. p. 12. ISBN 0-434-91473-8. Retrieved 8 May 2015.

boxerdiesel.com

"A True Engineering Revolution". SUBARU BOXER DIESEL. Fuji Heavy Industries Ltd. Archived from the original on 1 March 2014. Retrieved 20 December 2013.

"The Physics of: Engine Cylinder-Bank Angles". www.caranddriver.com. 14 October 2019. Retrieved 18 October 2019.

"Flat-6 Club: 1993 Subaru Impreza w/ Legacy 6-Cyl". www.dailyturismo.com. 12 June 2018. Archived from the original on 21 September 2019. Retrieved 21 September 2019.

"Flat-12 engine". Ferrari.com. Ferrari S.p.A. Archived from the original on 25 December 2013. Retrieved 21 December 2013.

Szymezak, Pascal. "Début de la légende". La saga GoldWing (in French). Fédération des GoldWing Club de France. Archived from the original on 19 December 2013. Retrieved 20 December 2013.

Hanlon, Mike (7 February 2001). "The world's first horizontally-opposed turbo diesel engine". Gizmag. Retrieved 20 December 2013.

Harwood, Allyson (January 2008). "2008 Subaru Turbodiesel Boxer - First Drive". MotorTrend Magazine. Source Interlink Media. Retrieved 20 December 2013.

"Distinct Engineering Mounted into the Subaru 1000". SUBARU Philosophy. Fuji Heavy Industries Ltd. 10 August 2012. Archived from the original on 21 December 2013. Retrieved 20 December 2013. Source: 'Subaru' magazine – Subaru 1000 extra edition (issued 1966-05-20)

Bonk, Aaron (7 February 2013). "How Boxer Engines Work". Super Street Magazine. Source Interlink Media. Archived from the original on 27 February 2014. Retrieved 21 December 2013.

English, Bob (29 April 2010). "The engine that Benz built still survives". The Globe and Mail. Canada. Archived from the original on 20 December 2013. Retrieved 19 December 2013.

Bonk, Aaron (7 February 2013). "How Boxer Engines Work". Super Street Magazine. Source Interlink Media. Archived from the original on 27 February 2014. Retrieved 21 December 2013.
English, Bob (29 April 2010). "The engine that Benz built still survives". The Globe and Mail. Canada. Archived from the original on 20 December 2013. Retrieved 19 December 2013.
Szymezak, Pascal. "Début de la légende". La saga GoldWing (in French). Fédération des GoldWing Club de France. Archived from the original on 19 December 2013. Retrieved 20 December 2013.
"Distinct Engineering Mounted into the Subaru 1000". SUBARU Philosophy. Fuji Heavy Industries Ltd. 10 August 2012. Archived from the original on 21 December 2013. Retrieved 20 December 2013. Source: 'Subaru' magazine – Subaru 1000 extra edition (issued 1966-05-20)
"Flat-6 Club: 1993 Subaru Impreza w/ Legacy 6-Cyl". www.dailyturismo.com. 12 June 2018. Archived from the original on 21 September 2019. Retrieved 21 September 2019.
"A True Engineering Revolution". SUBARU BOXER DIESEL. Fuji Heavy Industries Ltd. Archived from the original on 1 March 2014. Retrieved 20 December 2013.
"Flat-12 engine". Ferrari.com. Ferrari S.p.A. Archived from the original on 25 December 2013. Retrieved 21 December 2013.