http://www.history.com/topics/the-holocaust
http://history1900s.about.com/od/holocaust/tp/holocaust.htm
http://www.holocaust-history.org/
https://www.jewishvirtuallibrary.org/jsource/holo.html
http://www.ushmm.org/wlc/en/?WT.srch=1&WT.mc_id=10003&gclid=CJfBvtjNzLUCFYje4AodsXAA_Q
http://history1900s.about.com/od/holocaust/tp/holocaust.htm
http://www.holocaust-history.org/
https://www.jewishvirtuallibrary.org/jsource/holo.html
http://www.ushmm.org/wlc/en/?WT.srch=1&WT.mc_id=10003&gclid=CJfBvtjNzLUCFYje4AodsXAA_Q