Hoffmann 2013, p. 127: "Claus von Stauffenberg's brother Berthold was hanged, resuscitated, and hanged again, several times, and the hangings were filmed for Hitler's personal viewing." Hoffmann, P. (2013) [1992]. "The Second World War, German Society, and Internal Resistance to Hitler". In Large, D.C. (ed.). Contending with Hitler. Contending with Hitler: Varieties of German Resistance in the Third Reich. Cambridge University Press. pp. 119–128. doi:10.1017/CBO9781139052597.009. ISBN9781139052597.
Hoffmann 2013, p. 127: "Claus von Stauffenberg's brother Berthold was hanged, resuscitated, and hanged again, several times, and the hangings were filmed for Hitler's personal viewing." Hoffmann, P. (2013) [1992]. "The Second World War, German Society, and Internal Resistance to Hitler". In Large, D.C. (ed.). Contending with Hitler. Contending with Hitler: Varieties of German Resistance in the Third Reich. Cambridge University Press. pp. 119–128. doi:10.1017/CBO9781139052597.009. ISBN9781139052597.
Baigent, Michael; Leigh, Richard (1994). Secret Germany: Claus von Stauffenberg and the Mystical Crusade against Hitler. J. Cape. p. 123. ISBN0224035258. OCLC31038327.