
http://www.jewishvirtuallibrary.org/jsource/biography/karski.html
http://www.spartacus.schoolnet.co.uk/GERmein.htm
http://www.holocaust-history.org/short-essays/what-happened.shtml
http://www.history.com/encyclopedia.do?articleId=226140
http://www.ushmm.org/wlc/article.php?lang=en&ModuleId=10007652