Gw mau tau Catatan dari Ludwig Beck

Reynolds, Nicholas Treason was No Crime: Ludwig Beck, Chief of the German General Staff, 1975, London: Kimber, 1976, , OCLC: 2204228.

Schlabrendorff, Fabian von "Generäle gegen Hitler", Fisher Bücherei, FRG (BRD), 1959, pages 130ff and 144ff.