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David Burgess Wise, The New Illustrated Encyclopedia of Automobiles.
Esculapius in
Harald Linz, Halwart Schrader: Die Internationale Automobil-Enzyklopädie. United Soft Media Verlag, München 2008, ISBN978-3-8032-9876-8.
George Nick Georgano (Chefredakteur): The Beaulieu Encyclopedia of the Automobile. Volume 2: G–O. Fitzroy Dearborn Publishers, Chicago 2001, ISBN1-57958-293-1. (chapter Knight of the Road)
Marián Šuman-Hreblay: Automobile Manufacturers Worldwide Registry. McFarland & Company, Inc., Publishers, London 2000, ISBN0-7864-0972-X.