www.historyhit.com/facts-about-adolf-hitler/
www.britannica.com/biography/Adolf-Hitler
http://www.ducksters.com/biography/adolf_hitler.php
encyclopedia.ushmm.org/content/en/article/adolf-hitler-early-years-1889-1913
www.theguardian.com/world/2005/aug/04/research.secondworldwar