BMW E9 (English Wikipedia)

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de Jong 2009b. de Jong, Frank (2009b). "Part 4: 1976-1981 The dull years". History of the European Touring Car Championship & Other International Touring Car Races. Amsterdam: Frank de Jong. Archived from the original on 2 July 2010. Retrieved 2010-07-25.

"1961 to 1970". Karmann Company History. Karmann.com. Archived from the original on 6 May 2009. Retrieved 2 December 2022.
de Jong 2009. de Jong, Frank (2009). "Part 3: 1970-1975 The Ford and BMW years". History of the European Touring Car Championship & Other International Touring Car Races. Amsterdam: Frank de Jong. Archived from the original on 3 July 2010. Retrieved 2010-07-25.
de Jong 2009b. de Jong, Frank (2009b). "Part 4: 1976-1981 The dull years". History of the European Touring Car Championship & Other International Touring Car Races. Amsterdam: Frank de Jong. Archived from the original on 2 July 2010. Retrieved 2010-07-25.