Kil 1989. Kil, Wolfgang (1989). "Voelkner, Hans". Bundesstiftung Aufarbeitung (in German). Berlin: Bundesstiftung zur Aufarbeitung der SED-Diktatur. Retrieved 9 February 2023.
dkp-online.de
Fischer, Cristina (10 March 2006). "Zwischen Angst und Heldentum". Berlin: German Communist Party. Unsere Zeit. Archived from the original on 7 September 2018. Retrieved 19 February 2023.
Coppi 1996. Coppi, Hans Jr. (July 1996). Dietrich Bracher, Karl; Schwarz, Hans-Peter; Möller, Horst (eds.). "Die Rote Kapelle" [The Red Orchestra in the field of conflict and intelligence activity, The Trepper Report June 1943] (PDF). Quarterly Books for Contemporary History (in German). 44 (3). Munich: Institute of Contemporary History. ISSN0042-5702. Archived from the original(PDF) on 18 May 2015. Retrieved 9 December 2018.
Coppi 1996. Coppi, Hans Jr. (July 1996). Dietrich Bracher, Karl; Schwarz, Hans-Peter; Möller, Horst (eds.). "Die Rote Kapelle" [The Red Orchestra in the field of conflict and intelligence activity, The Trepper Report June 1943] (PDF). Quarterly Books for Contemporary History (in German). 44 (3). Munich: Institute of Contemporary History. ISSN0042-5702. Archived from the original(PDF) on 18 May 2015. Retrieved 9 December 2018.
Fischer, Cristina (10 March 2006). "Zwischen Angst und Heldentum". Berlin: German Communist Party. Unsere Zeit. Archived from the original on 7 September 2018. Retrieved 19 February 2023.
worldcat.org
search.worldcat.org
Coppi 1996. Coppi, Hans Jr. (July 1996). Dietrich Bracher, Karl; Schwarz, Hans-Peter; Möller, Horst (eds.). "Die Rote Kapelle" [The Red Orchestra in the field of conflict and intelligence activity, The Trepper Report June 1943] (PDF). Quarterly Books for Contemporary History (in German). 44 (3). Munich: Institute of Contemporary History. ISSN0042-5702. Archived from the original(PDF) on 18 May 2015. Retrieved 9 December 2018.