"Millionen für Amok-Opfer" [Millions for spree killing victims]. FOCUS (in German). 7 April 2012. Archived from the original on 4 August 2019. Retrieved 4 August 2019.
heise.de
Brinkemper, Peter V. (29 April 2002). "Schau mir in die Augen" [Look me in the eyes]. Telepolis (in German). Retrieved 12 April 2019.
"Millionen für Amok-Opfer" [Millions for spree killing victims]. FOCUS (in German). 7 April 2012. Archived from the original on 4 August 2019. Retrieved 4 August 2019.