-Who's Who in Nazi Germany Robert S. Wistrich
-The German Opposition to Hitler: The Resistance, the Underground and Assassination Plots, 1938-1945 (by Michael C. Thomsett page 147 1997)
- The Von Hassell Diaries 1938-1944: The Story of the Forces Against Hitler Inside Germany (1971)
- Clark, R.M., The Evangelical Knights of Saint John (2003), p. 45
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