Editing Cryptanalysis of the Enigma (section)

==Bibliography==
{{Refbegin|30em}}
* {{citation |last=Alexander |first=C. Hugh O'D. |author-link=Conel Hugh O'Donel Alexander |year=c. 1945 |title=Cryptographic History of Work on the German Naval Enigma |publisher=The National Archives, Kew, Reference HW 25/1 |url=http://www.ellsbury.com/gne/gne-000.htm}}
*{{citation |last=Bamford |first=James |author-link=James Bamford |year=2001 |title=Body Of Secrets: How America's NSA & Britain's GCHQ Eavesdrop on the World |publisher=Century |isbn=978-0-7126-7598-7}}
* {{citation |last=Batey |first=Mavis |author-link=Mavis Batey |year=2008 |title=From Bletchley with Love |location=Milton Keynes |publisher=Bletchley Park Trust |isbn=978-1-906723-04-0}}
* {{citation |last=Bauer |first=Friedrich Ludwig |author-link=Friedrich L. Bauer |title=Decrypted secrets: methods and maxims of cryptology |place=New York |publisher=Springer |year=2002 |edition=3rd rev. and updated |isbn=978-3-540-42674-5}}
* {{citation |last=Bauer |first=F.L. |author-link=Friedrich L. Bauer |title=The history of information security: a comprehensive handbook |publisher=Elsevier |year=2007 |editor-last=de Leeuw |editor-first=Karl |editor2-last=Bergstra |editor2-first=J. A. |chapter=British and US cryptanalysis of the Wehrmacht Enigma |isbn=978-0-444-51608-4}}
* {{citation |last=Bertrand |first=Gustave |author-link=Gustave Bertrand |year=1973 |title=Enigma ou la plus grand énigme de la guerre 1939–1945 (Enigma: The Greatest Enigma of the War of 1939–1945) |location=Paris |publisher=Librairie Plon}}
* {{citation |last=Bloch |first=Gilbert |publication-date=July 1987 |year=1987 |title=Enigma before Ultra: Polish Work and the French Contribution – Translated by C.A. Deavours |periodical=[[Cryptologia]] |volume=11 |pages=142–155 |doi=10.1080/0161-118791861947}}
* {{citation |last=Brown |first=Brandi Dawn |title=Enigma- German Machine Cipher- "Broken" by Polish Cryptologists |year=1998 |url=https://mathweb.ucsd.edu/~crypto/students/enigma.html#pt4 |access-date=9 June 2010}}
* {{citation |last=Brzezinski |first=Zbigniew |author-link=Zbigniew Brzezinski |title=Marian Rejewski, 1905–1980: living with the Enigma secret |place=Bydgoszcz, Poland |publisher=Bydgoszcz City Council |year=2005 |contribution=The Unknown Victors |editor-last=Ciechanowski |editor-first=Stanisław |pages=15–18 |isbn=83-7208-117-4}}
* {{citation |last=Budiansky |first=Stephen |year=2000 |title=Battle of wits: The Complete Story of Codebreaking in World War II |publisher=Free Press |isbn=978-0-684-85932-3 |url=https://archive.org/details/battleofwitscomp00budi}}
* {{citation |last=Calvocoressi |first=Peter |author-link=Peter Calvocoressi |title=Top Secret Ultra |place=Kidderminster, England |publisher=M & MBaldwin |orig-year=1980 |year=2001 |isbn=0-947712-41-0}}
* {{citation |last=Churchhouse |first=Robert |title=Codes and Ciphers: Julius Caesar, the Enigma and the Internet |place=Cambridge |publisher=Cambridge University Press |year=2002 |isbn=978-0-521-00890-7 |url=https://archive.org/details/codesciphersjuli0000chur |url-access=registration}}
* {{citation |last=Comer |first=Tony |title=Commentary: Poland's Decisive Role in Cracking Enigma and Transforming the UK's SIGINT Operations |publisher=[[Royal United Services Institute]] |year=2021 |url=https://rusi.org/explore-our-research/publications/commentary/polands-decisive-role-cracking-enigma-and-transforming-uks-sigint-operations}}
* {{citation |last=Copeland |first=Jack |author-link=Jack Copeland |year=2004 |contribution=Enigma |editor-last=Copeland |editor-first=B. Jack |editor-link=Jack Copeland |title=The Essential Turing: Seminal Writings in Computing, Logic, Philosophy, Artificial Intelligence, and Artificial Life ''plus'' The Secrets of Enigma |location=Oxford |publisher=Oxford University Press |isbn=0-19-825080-0}}
* {{citation |last1=DeBrosse |first1=Jim |last2=Burke |first2=Colin |year=2004 |title=The Secret in Building 26: The Untold Story of America's Ultra War Against the U-Boat Enigma Codes |publisher=Random House |isbn=978-0-375-50807-3 |url=https://archive.org/details/secretinbuilding00debr |url-access=registration}}
* {{citation |last=Ellsbury |first=Graham |publication-date=1998 |year=1998a |title=Description of the Enigma Machine |series=The Enigma Machine: Its Construction, Operation and Complexity |url=http://www.ellsbury.com/enigma2.htm |access-date=21 January 2009}}
* {{citation |last=Ellsbury |first=Graham |year=1998b |contribution=The Turing Bombe: What it was and how it worked |contribution-url=http://www.ellsbury.com/bombe3.htm |editor-last=Ellsbury |editor-first=Graham |title=The Enigma and the Bombe |url=http://www.ellsbury.com/enigmabombe.htm}}
* {{citation |last=Erskine |first=Ralph |title=The Holden Agreement on Naval Sigint: The First BRUSA? |journal=Intelligence and National Security |volume=14 |issue=2 |year=1999 |pages=187–189 |doi=10.1080/02684529908432545 |url=http://intellit.muskingum.edu/alpha_folder/E_folder/erskine_a-o.html}}
* {{citation |last=Erskine |first=Ralph |publication-date=December 2006 |year=2006 |title=The Poles Reveal their Secrets: Alastair Denniston's Account of the July 1939 Meeting at Pyry |periodical=[[Cryptologia]] |volume=30 |issue=4 |pages=294–305 |doi=10.1080/01611190600920944 |s2cid=13410460}}
* {{citation |last=Ferris |first=John Robert |title=Intelligence and strategy: selected essays |publisher=Routledge |year=2005 |edition=illustrated |isbn=978-0-415-36194-1}}
* {{citation |contribution=Facts and Myths of Enigma: Breaking Stereotypes |last1=Gaj |first1=Kris |last2=Orlowski |first2=Arkadiusz |editor-first=Eli |pages=106–122 |editor-last=Biham |title=Advances in Cryptology — EUROCRYPT 2003: International Conference on the Theory and Applications of Cryptographic Techniques |location=Warsaw, Poland |date=May 2003 |id=LNCS 2656 |publisher=Springer-Verlag |isbn=3-540-14039-5 |url=https://books.google.com/books?}}
* {{citation |last=Gannon |first=James |author-link=James Gannon (author) |year=2002 |title=Stealing Secrets, Telling Lies: How Spies and Codebreakers Helped Shape the Twentieth Century |location=Washington, D.C. |publisher=Brassey's |isbn=978-1-57488-367-1 |url=https://archive.org/details/stealingsecretst00gann}}
* {{citation |last=Gillogly |first=James J. |author-link=James J. Gillogly |publication-date=October 1995 |year=1995 |title=Ciphertext-only Cryptanalysis of Enigma |periodical=[[Cryptologia]] |volume=19 |issue=4 |pages=405–412 |doi=10.1080/0161-119591884060 |url=http://members.fortunecity.com/jpeschel/gillog1.htm |access-date=1 February 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090207192848/http://members.fortunecity.com/jpeschel/gillog1.htm |archive-date=7 February 2009}}
*{{citation |last=Harper |first=John |publication-date=Spring 2009 |periodical=Resurrection: The Bulletin of the Computer Conservation Society |publisher=British Computer Society |issue=46 |pages=7–8 |title=Bombe Rebuild Project |url=https://www.computerconservationsociety.org/resurrection.htm |access-date=22 May 2009}}
* {{citation |last=Herivel |first=John |author-link=John Herivel |year=2008 |title=Herivelismus and the German Military Enigma |publisher=M.& M.Baldwin |isbn=978-0-947712-46-4}}
* {{citation |last=Hinsley |first=F.H. |author-link=Harry Hinsley |orig-year=1992 |year=1993 |contribution=Introduction: The influence of Ultra in the Second World War |editor-last=Hinsley |editor-first=F.H. |editor-link=Harry Hinsley |editor2-last=Stripp |editor2-first=Alan |title=Codebreakers: The inside story of Bletchley Park |location=Oxford |publisher=Oxford University Press |isbn=978-0-19-280132-6}}
* {{citation |last=Hodges |first=Andrew |author-link=Andrew Hodges |year=1983 |edition=1992 |title=[[Alan Turing: The Enigma]] |location=London |publisher=[[Vintage Books|Vintage]] |isbn=978-0-09-911641-7}}
* {{citation |last=Hodges |first=Andrew |author-link=Andrew Hodges |year=1995 |title=Alan Turing: a short biography: Part 4 The Second World War |url=https://www.turing.org.uk/publications/dnb.html |access-date=23 October 2008}}
* {{citation |last1=Huttenhain |first1=Orr |last2=Fricke |title=OKW/Chi Cryptanalytic Research on Enigma, Hagelin and Cipher Teleprinter Messages |publisher=TICOM |year=1945 |url=https://drive.google.com/file/d/0B7sNVKDp-yiJOWYxZWFmNDgtODUyMS00Y2FiLThkNWItYmQ5N2JmMzEyMzIz/view}} This paper was written at the request of [[TICOM]] to show how the various German cipher machines could be solved. The authors assume [[Kerckhoffs's principle]] and do not address the breaking of the machines, only the solving of keys.
* {{citation |last=Jacobsen |first=Philip H. |title=British provision of German naval Enigma information |year=2000 |url=http://lists101.his.com/pipermail/intelforum/2000-August/002580.html |access-date=26 March 2010 |url-status=dead |archive-url=https://web.archive.org/web/20110711171026/http://lists101.his.com/pipermail/intelforum/2000-August/002580.html |archive-date=2011-07-11}}
* {{citation |last=Jones |first=R. V. |author-link=Reginald Victor Jones |title=Most Secret War |place=London |publisher=Book Club Associates |year=1978 |isbn=978-0-241-89746-1 |url=https://archive.org/details/mostsecretwar0000jone}}
* {{citation |last=Kahn |first=David |author-link=David Kahn (writer) |year=1991 |title=Seizing the Enigma: The Race to Break the German U-boat Codes, 1939–1943 |publisher=Houghton Mifflin Co. |isbn=978-0-395-42739-2}}
* {{citation |last=Kahn |first=David |author-link=David Kahn (writer) |title=The Codebreakers: The Comprehenisve History of Secret Communication from Ancient Times to the Internet |place=New York |publisher=Scribner |year=1966 |isbn=0-684-83130-9}}
* {{citation |last=Kozaczuk |first=Władysław |author-link=Władysław Kozaczuk |year=1984 |title=Enigma: How the German Machine Cipher was Broken, and how it was Read by the Allies in World War Two, edited and translated by [[Christopher Kasparek]] |edition=2 |place=Frederick, Maryland |publisher=University Publications of America |isbn=978-0-89093-547-7}} A revised and augmented translation of ''W kręgu enigmy'', [[Warsaw]], Książka i Wiedza, 1979, supplemented with appendices by [[Marian Rejewski]]
* {{citation |last1=Kozaczuk |first1=Władysław |author-link=Władysław Kozaczuk |last2=Straszak |first2=Jerzy |year=2004 |title=Enigma: How the Poles Broke the Nazi Code |place=New York |publisher=Hippocrene Books |isbn=978-0-7818-0941-2}} Largely an abridgment of {{Harvnb|Kozaczuk|1984}}, minus Rejewski's appendices, which have been replaced with appendices of varying quality by other authors
* {{citation |last=Lewin |first=Ronald |title=Ultra Goes to War: The Secret Story |edition=Classic Penguin |series=Classic Military History |orig-year=1978 |year=2001 |publication-date=2001 |publisher=Hutchinson & Co |location=London, England |isbn=978-1-56649-231-7}}
* {{citation |last=Mahon |first=A.P. |title=The History of Hut Eight 1939–1945 |publisher=UK National Archives Reference HW 25/2 |year=1945 |url=http://www.ellsbury.com/hut8/hut8-000.htm |access-date=10 December 2009}}
* {{citation |last=Miller |first=A. Ray |year=2001 |title=The Cryptographic Mathematics of Enigma |publisher=Center for Crypologic History |url=http://ed-thelen.org/comp-hist/NSA-Comb.html |access-date=1 February 2009 |url-status=dead |archive-url=https://web.archive.org/web/20081202112306/http://www.ed-thelen.org/comp-hist/NSA-Comb.html |archive-date=2 December 2008}}
* {{citation |last=Milner-Barry |first=Stuart |author-link=Stuart Milner-Barry |year=1993 |contribution=Navy Hut 6: Early days |editor-last=Hinsley |editor-first=F.H. |editor-link=Harry Hinsley |editor2-last=Stripp |editor2-first=Alan |title=Codebreakers: The inside story of Bletchley Park |location=Oxford |publisher=Oxford University Press |isbn=978-0-19-280132-6}}
* {{citation |last=Morris |first=Christopher |year=1993 |contribution=Navy Ultra's Poor Relations |editor-last=Hinsley |editor-first=F.H. |editor-link=Harry Hinsley |editor2-last=Stripp |editor2-first=Alan |title=Codebreakers: The inside story of Bletchley Park |location=Oxford |publisher=Oxford University Press |isbn=978-0-19-280132-6}}
* {{citation |last=Murray |first=Joan |year=1993 |contribution=Hut 8 and naval Enigma, Part 1 |editor-last=Hinsley |editor-first=F.H. |editor-link=Harry Hinsley |editor2-last=Stripp |editor2-first=Alan |title=Codebreakers: The inside story of Bletchley Park |location=Oxford |publisher=Oxford University Press |isbn=978-0-19-280132-6}}
* {{citation |last=Rejewski |first=Marian |author-link=Marian Rejewski |title=Sprawozdanie z prac kryptologicznych nad niemieckim szyfrem maszynowym Enigma |trans-title=Report of Cryptologic Work on the German Enigma Machine Cipher |language=pl |year=1942}} Manuscript written at [[Uzès]], France
* {{citation |last=Rejewski |first=Marian |author-link=Marian Rejewski |title=Wspomnienia z mej pracy w Biurze Szyfrów Oddziału II Sztabu Głównego 1932–1945 |trans-title=Memoirs of My Work in the Cipher Bureau of Section II of the [Polish] General Staff |language=pl |year=1967}} Manuscript
* {{citation |last=Rejewski |first=Marian |author-link=Marian Rejewski |title=An Application of the Theory of Permutations in Breaking the Enigma Cipher |journal=Applicationes Mathematicae |volume=16 |issue=4 |year=1980 |pages=543–559 |issn=1730-6280 |doi=10.4064/am-16-4-543-559 |doi-access=free |url=https://cryptocellar.org/}}
* {{citation |last=Rejewski |first=Marian |author-link=Marian Rejewski |publication-date=January 1982 |year=1982 |title=Remarks on Appendix 1 to ''British Intelligence in the Second World War'' by F.H. Hinsley", translated by Christopher Kasparek |periodical=Cryptologia |volume=6 |issue=1 |pages=75–83 |doi=10.1080/0161-118291856867}}
* {{citation |last1=Rejewski |first1=Marian |author-link=Marian Rejewski |last2=Woytak |first2=Richard |author2-link=Richard Woytak |year=1984b |title=A Conversation with Marian Rejewski}} Appendix B of {{Harvnb|Kozaczuk|1984|pp=229–40}}
* {{citation |last=Rejewski |first=Marian |author-link=Marian Rejewski |year=1984c |title=Summary of Our Methods for Reconstructing ENIGMA and Reconstructing Daily Keys, and of German Efforts to Frustrate Those Methods}} Appendix C of {{Harvnb|Kozaczuk|1984|pp=241–245}}
* {{citation |last=Rejewski |first=Marian |author-link=Marian Rejewski |year=1984d |title=How the Polish Mathematicians Broke Enigma}} Appendix D of {{Harvnb|Kozaczuk|1984|pp=246–271}}
* {{citation |last=Rejewski |first=Marian |author-link=Marian Rejewski |year=1984e |title=The Mathematical Solution of the Enigma Cipher}} Appendix E of {{Harvnb|Kozaczuk|1984|pp=272–291}}
* {{citation |last=Rezabek |first=Randy |title=TICOM: the Hunt for Hitler's Codebreakers |publisher=Independently published |year=2017 |isbn=978-1521969021 |url=http://www.ticomarchive.com/home |access-date=18 February 2018 |url-status=dead |archive-url=https://web.archive.org/web/20220526090410/http://www.ticomarchive.com/home |archive-date=26 May 2022}}
* {{citation |last=Sale |first=Tony |author-link=Anthony Sale |title=The difficulties in breaking German Naval Enigma: Turing's Work |work=Bigrams, Trigrams and Naval Enigma |url=https://www.codesandciphers.org.uk/lectures/naval1.htm |access-date=26 November 2009}}
* {{citation |last=Sebag-Montefiore |first=Hugh |author-link=Hugh Sebag-Montefiore |year=2000 |title=Enigma: The Battle for the Code |location=New York |publisher=John Wiley |isbn=0-471-40738-0 |url=https://books.google.com/books?id=AUnmwrKa1XcC&pg=PA21}}
* {{citation |last=Sebag-Montefiore |first=Hugh |author-link=Hugh Sebag-Montefiore |edition=Cassell Military Paperbacks |year=2004 |orig-year=2000 |title=Enigma: The Battle for the Code |location=London |publisher=Weidenfeld & Nicolson |isbn=978-0-297-84251-4 |url=https://archive.org/details/enigmabattleforc0000seba |url-access=registration}}
* {{citation |last=Singh |first=Simon |author-link=Simon Singh |year=1999 |title=[[The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography]] |location=London |publisher=Fourth Estate |isbn=1-85702-879-1}}
* {{citation |last=Smith |first=Michael |author-link=Michael Smith (newspaper reporter) |title=Station X: The Codebreakers of Bletchley Park |edition=Pan Books |series=Pan Grand Strategy Series |year=2007 |orig-year=1998 |publisher=Pan MacMillan Ltd |location=London |isbn=978-0-330-41929-1}}
* {{citation |last=Smith |first=Michael |author-link=Michael Smith (newspaper reporter) |year=2006 |contribution=How it began: Bletchley Park Goes to War |editor-last=Copeland |editor-first=B Jack |editor-link=Jack Copeland |title=Colossus: The Secrets of Bletchley Park's Codebreaking Computers |location=Oxford |publisher=Oxford University Press |isbn=978-0-19-284055-4}}
* {{citation |title=Spymistress: The Life of Vera Atkins, the Greatest Female Secret Agent of World War II |last=Stevenson |first=William |publisher=[[Arcade Publishing]] |via=[[Internet Archive]] |date=November 2006 |isbn=978-1-55970-763-3 |url=https://archive.org/details/spymistresslifeo00will |url-access=registration}}
* {{citation |last1=Sullivan |first1=Geoff |last2=Weierud |first2=Frode |year=2005 |title=Breaking German Army Ciphers |periodical=Cryptologia |volume=24 |issue=3 |pages=193–232 |doi=10.1080/01611190508951299 |s2cid=23474156 |url=https://cryptocellar.org/pubs/bgac.pdf |access-date=16 October 2008 |url-status=dead |archive-url=https://web.archive.org/web/20170929044802/http://cryptocellar.org/pubs/bgac.pdf |archive-date=29 September 2017}}
* {{citation |last=Taunt |first=Derek |author-link=Derek Taunt |year=1993 |contribution=Hut 6: 1941-1945 |editor-last=Hinsley |editor-first=F.H. |editor-link=Harry Hinsley |editor2-last=Stripp |editor2-first=Alan |title=Codebreakers: The inside story of Bletchley Park |location=Oxford |publisher=Oxford University Press |isbn=978-0-19-280132-6}}
* {{citation |last=Turing |first=Alan |author-link=Alan Turing |year=1940 |editor-first=Ralph |editor-last=Erskine |editor2-last=Marks |editor2-first=Philip |editor3-last=Weierud |editor3-first=Frode |title=Turing's Treatise on Enigma (The Prof's Book) |url=http://cryptocellar.org/Turing/ |access-date=1 February 2009 |url-status=dead |archive-url=https://web.archive.org/web/20110910054444/http://www.cryptocellar.org/Turing/ |archive-date=10 September 2011}}
* {{citation |last=Turing |first=Alan |author-link=Alan Turing |year=c. 1941 |contribution=Memorandum to OP-20-G on Naval Enigma |editor-last=Copeland |editor-first=B. Jack |editor-link=Jack Copeland |title=The Essential Turing: Seminal Writings in Computing, Logic, Philosophy, Artificial Intelligence, and Artificial Life ''plus'' The Secrets of Enigma |location=Oxford |publisher=Oxford University Press |pages=341–352 |isbn=0-19-825080-0}}
* {{citation |last=Twinn |first=Peter |author-link=Peter Twinn |year=1993 |contribution=The ''Abwehr'' Enigma |editor-last=Hinsley |editor-first=F.H. |editor-link=Harry Hinsley |editor2-last=Stripp |editor2-first=Alan |title=Codebreakers: The inside story of Bletchley Park |location=Oxford |publisher=Oxford University Press |isbn=978-0-19-280132-6}}
* {{citation |last=US Army |title=The US 6812 Division Bombe Report Eastcote 1944 |year=1945 |url=https://www.codesandciphers.org.uk/documents/bmbrpt/bmbpg001.htm |access-date=1 May 2010 |url-status=live |archive-url=https://web.archive.org/web/20090722155542/http://www.codesandciphers.org.uk/documents/bmbrpt/bmbpg001.HTM |archive-date=22 July 2009}}
* {{citation |last=Welchman |first=Gordon |author-link=Gordon Welchman |orig-year=1982 |year=1984 |title=The Hut Six story: Breaking the Enigma codes |location=Harmondsworth, England |publisher=Penguin Books |isbn=9780140053050 |url=https://archive.org/details/hutsixstorybreak00welc}} An early publication containing several misapprehensions that are corrected in an ''addendum'' in the 1997 edition.
* {{citation |last=Welchman |first=Gordon |author-link=Gordon Welchman |orig-year=1982 |year=1997 |title=The Hut Six story: Breaking the Enigma codes |location=Cleobury Mortimer, England |publisher=M&M Baldwin |isbn=978-0-947712-34-1}} New edition updated with an ''addendum'' consisting of a 1986 paper written by Welchman that corrects his misapprehensions in the 1982 edition.
* {{citation |last=Welchman |first=Gordon |author-link=Gordon Welchman |title=From Polish Bomba to British Bombe: the Birth of Ultra |journal=Intelligence and National Security |volume=1 |issue=1 |year=1986 |place=Ilford, England |publisher=Frank Cass & Company |pages=71–110 |doi=10.1080/02684528608431842}} This is reproduced as an ''addendum'' in the 1997 edition of Welchman's 'The Hut Six Story'.
* {{citation |last1=Wenger |first1=J. N. |last2=Engstrom |first2=H. T. |last3=Meader |first3=R. I. |orig-year=1944 |year=1998 |title=History of The Bombe Project: Memorandum for the Director of Naval Communications |publisher=The Mariner's Museum |url=http://www.daytoncodebreakers.org/docs/bombe_history.htm |url-status=dead |archive-url=https://web.archive.org/web/20100616230244/http://www.daytoncodebreakers.org/docs/bombe_history.htm |archive-date=2010-06-16}}
* {{citation |last=Wenger |first=J. N. |title=Solving the Enigma: History of the Cryptanalytic Bombe, a NSA phamphlet |chapter=Appendix II: U. S. Army Cryptanalytic Bombe |year=1945 |chapter-url=http://ed-thelen.org/comp-hist/NSA-Enigma.html |access-date=9 April 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100317234354/http://ed-thelen.org/comp-hist/NSA-Enigma.html |archive-date=17 March 2010}} (also National Archives and Records Administration Record Group 457, File 35701.)
* {{citation |last=Wilcox |first=Jennifer E. |year=2001 |title=Solving the Enigma: History of the Cryptanalytic Bombe, a NSA phamphlet |chapter=About the Enigma |publisher=Center for Cryptologic History, National Security Agency |chapter-url=http://ed-thelen.org/comp-hist/NSA-Enigma.html |access-date=9 April 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100317234354/http://ed-thelen.org/comp-hist/NSA-Enigma.html |archive-date=17 March 2010}} ASIN: B0006RLRA4
* {{citation |last=Winterbotham |first=F. W. |author-link=F. W. Winterbotham |title=The Ultra secret: the inside story of Operation Ultra, Bletchley Park and Enigma |place=London |publisher=Orion Books Ltd |orig-year=1974 |year=2000 |oclc=222735270 |isbn=978-0-7528-3751-2}}
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