Coppi Jr., Hans (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: 431–458. ISSN0042-5702. Archived from the original(PDF) on 18 May 2015. Retrieved 9 December 2018.
Coppi Jr., Hans (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: 431–458. ISSN0042-5702. Archived from the original(PDF) on 18 May 2015. Retrieved 9 December 2018.
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Coppi Jr., Hans (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: 431–458. ISSN0042-5702. Archived from the original(PDF) on 18 May 2015. Retrieved 9 December 2018.