Notes
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- Heiber , Helmut , ed. 1962 . Hillers Lagebesprechungen , Stuttgart : Deutsche Verlags‐Anstalt .
- Eigner , Gustav . 1976 . (Former Abwehr personnel) . Internationale Wehrrevue , 9 Oct. : 861 Letter to the Editor,
- Andrew , Christopher . 1988 . “ ‘Historical Research on the British Intelligence Community’ ” . In Comparing Foreign Intelligence , Edited by: Godson , R. 43 – 64 . NY/London : Pergamon‐Brassey's .
- Rohwer , J. 1997 . ‘International Historiography about Signal Intelligence’ . The Enigma Bulletin , 2 May : 3 – 16 .
- Flicke , Wilhelm . 1977 . War Secrets in the Ether , 2 vols , 24 – 6 . Laguna Hills , CA : Aegean Park Press .
- Welchman , Gordon . 1982 . The Hut 6 Story , NY : McGraw‐Hill .
- Hinsley , F.H. Thomas , E. 1979–1990 . British Intelligence in the Second World War , Vol.IV , 182 London : HMSO .
- 1985 . ‘The German Navy Evaluates Its Cryptographic Security, October 1941’ . Military Affairs , 49 ( 2 ) April : 75 – 9 .
- Garlinski , Józef . 1979 . The Enigma War , NY : Scribner's .
- 1991 . Seizing the Enigma , Boston : Houghton Mifflin .
- Harris , Robert . 1995 . Enigma , London/NY : Random House .
- Wark , W. 1985 . The Ultimate Enemy: British Intelligence and Nazi Germany 1933–1945 , Ithaca , NY : Cornell UP .
- McLachlan , D. 1968 . Room 39: Naval Intelligence in Action 1939^45 , London : Weidenfeld .
- Bonatz , Heinz . 1970 . Die deutsche Marine Funkaufklärung , 87 Darmstadt : Wehr & Wissen .
- Mendelsohn , John , ed. 1989 . German Radio Intelligence and the Soldatensender , NY : Garland .
- Calvocoressi , Peter . 1980 . Top Secret ULTRA , NY : Patheon Books .
- Persico , Joseph E. 1979 . Piercing the Reich , NY : Viking .