Hartmann, Ulrich (11 May 2010). ""Ich könnte heulen"" [I could cry] (in German). Sueddeutsche.de. Archived from the original on 24 September 2015. Retrieved 6 September 2014.
Hartmann, Ulrich (11 May 2010). ""Ich könnte heulen"" [I could cry] (in German). Sueddeutsche.de. Archived from the original on 24 September 2015. Retrieved 6 September 2014.