Vincenti, Walter (1997). "Engineering Theory in the Making: Aerodynamic Calculation "Breaks the Sound Barrier"". Technology and Culture. 38 (4): 819–851. JSTOR310695.
Schulz, Matthias (19 February 2001). "Flammenritt über dem Moor". Der Spiegel. Archived from the original on 25 September 2015. Retrieved 3 September 2015.
Schulz, Matthias (19 February 2001). "Flammenritt über dem Moor". Der Spiegel. Archived from the original on 25 September 2015. Retrieved 3 September 2015.