Transverse engine (English Wikipedia)

Smith 1972, p. 9. Smith, Brian E. (1972). The Daimler Tradition. Isleworth, UK: Transport Bookman. ISBN 085184 014 0.
Robson 2010, p. 17. Robson, Graham (2010). Saab 96 & V4. Poundbury, Dorchester, UK: Veloce. ISBN 978-1-845842-56-7. Retrieved 26 April 2015.
Clarke 2010, p. 44. Clarke, Massimo (2010). Modern Motorcycle Technology: How Every Part of Your Motorcycle Works. Minneapolis, MN USA: MotorBooks International. p. 44. ISBN 978-0-7603-3819-3. Retrieved 2013-05-31. Moto Guzzi's transverse V-twins are unique among motorcycles, while Ducati, in keeping with the classical school, uses a longitudinal V, meaning the axis of rotation of the crankshaft is transverse to the frame.
Grubb 1975, p. 85. Grubb, Jake (March 1975). Linkletter, John A. (ed.). "Easy riders—the grand touring motorcycles for '75". Popular Mechanics. 143 (3). New York, NY USA: Hearst: 82–85, 126–127. ISSN 0032-4558. Retrieved 2013-05-31.
Grubb 1975, pp. 82, 83. Grubb, Jake (March 1975). Linkletter, John A. (ed.). "Easy riders—the grand touring motorcycles for '75". Popular Mechanics. 143 (3). New York, NY USA: Hearst: 82–85, 126–127. ISSN 0032-4558. Retrieved 2013-05-31.

landrovercary.com

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Grubb 1975, p. 85. Grubb, Jake (March 1975). Linkletter, John A. (ed.). "Easy riders—the grand touring motorcycles for '75". Popular Mechanics. 143 (3). New York, NY USA: Hearst: 82–85, 126–127. ISSN 0032-4558. Retrieved 2013-05-31.
Grubb 1975, pp. 82, 83. Grubb, Jake (March 1975). Linkletter, John A. (ed.). "Easy riders—the grand touring motorcycles for '75". Popular Mechanics. 143 (3). New York, NY USA: Hearst: 82–85, 126–127. ISSN 0032-4558. Retrieved 2013-05-31.