Horn, Jan (2005-06-16). "BMW M6 fordert Ferrari 575M F1: Hirn oder Herz" [BMW M6 challenges Ferrari 575M F1: Brain or heart]. Auto Bild (in German). Axel Springer Auto Verlag GmbH. Archived from the original on 2012-01-26. Retrieved 2013-01-15.
Horn, Jan (2005-06-16). "BMW M6 fordert Ferrari 575M F1: Hirn oder Herz" [BMW M6 challenges Ferrari 575M F1: Brain or heart]. Auto Bild (in German). Axel Springer Auto Verlag GmbH. Archived from the original on 2012-01-26. Retrieved 2013-01-15.