Heinrich Koenen (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Heinrich Koenen" in English language version.

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archive.org

Kesaris, Paul. L, ed. (1979). The Rote Kapelle: the CIA's history of Soviet intelligence and espionage networks in Western Europe, 1936-1945 (pdf). Washington DC: University Publications of America. p. 302. ISBN 978-0-89093-203-2. Retrieved 12 May 2022.
Kesaris, Paul. L, ed. (1979). The Rote Kapelle: the CIA's history of Soviet intelligence and espionage networks in Western Europe, 1936-1945 (pdf). Washington DC: University Publications of America. p. 134. ISBN 978-0-89093-203-2. Retrieved 12 May 2022.

worldcat.org

Tyas, Stephen (25 June 2017). SS-Major Horst Kopkow: From the Gestapo to British Intelligence. Fonthill Media. p. 189. ISBN 9781781555989. OCLC 990804265.