Hanfstaengl, Ernst. Hitler: The Memoir of a Nazi Insider that Turned Against the Fuhrer. New York, New York: Arcade Publishing. 1957: 108. My wife hurried up to the attic and found Hitler in a state of frenzy. He had pulled out his revolver with his good hand and shouted, ‘This is the end. I will never let these swine take me. I will shoot myself first.’ It so happened that I had taught my wife one of the few ju-jitsu tricks I know, for wrenching a pistol out of someone’s grasp. Hitler’s movements were awkward with his dislocated shoulder and she managed to get the thing away from him and fling it into a two-hundredweight barrel of flour we kept up in the attic to combat the recurrent shortages.
William Shirer, Rise and Fall of the Third Reich, (Simon & Schuster, 1960), Chpt.2, pp. 47.
Hanfstaengl, Ernst 'Putzi'. Hitler: The Missing Years. London: Eyre & Spottiswoode, 1957. Arcade Publishing, reprint 1994 ISBN1-55970-278-8
Conradi, Peter. Hitler's Piano Player: The Rise and Fall of Ernst Hanfstaengl, Confidant of Hitler, Ally of FDR, Carroll & Graf, 2004 ISBN0-7867-1283-X
Metcalfe, Philip. 1933. New York, The Permanent Press, 1988. ISBN0-932966-87-X
Hanfstaengl, Ernst. "Zwischen Weißem und Braunem Haus". R. Piper und Co. Verlag Muenchen