https://www.google.ca/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1280&bih=923&q=joachim+krolls+family&oq=joachim+krolls+family&gs_l=img.4...3027.8272.0.8512.21.12.0.9.2.0.127.815.8j4.12.0....0...1ac.1.42.img..13.8.348.2Fei21uAqs0#hl=en&q=joachim+kroll's+trial&tbm=isch&imgdii=_
http://en.wikipedia.org/wiki/Joachim_Kroll
http://www.crimelibrary.com/serial_killers/weird/joachim_kroll/1_index.html
http://www.truecrimereport.com/2011/02/joachim_kroll_the_serial_kille.php
http://serialkillercentral.blogspot.ca/2010/07/joachim-kroll-ruhr-hunter.html
http://en.wikipedia.org/wiki/Joachim_Kroll
http://www.crimelibrary.com/serial_killers/weird/joachim_kroll/1_index.html
http://www.truecrimereport.com/2011/02/joachim_kroll_the_serial_kille.php
http://serialkillercentral.blogspot.ca/2010/07/joachim-kroll-ruhr-hunter.html