Bauer, F.L. (2007), "British and US cryptanalysis of the Wehrmacht Enigma", in de Leeuw, Karl; Bergstra, J. A. (eds.), The history of information security: a comprehensive handbook, Elsevier, ISBN978-0-444-51608-4
Bauer, Friedrich L. (2006a), The Tiltman Break Appendix 5 in Copeland 2006, pp. 370–377 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Bauer, Friedrich L. (2006b), Newman's Theorem Appendix 8 in Copeland 2006, pp. 370–377 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Bauer, Friedrich L. (2006c), Origins of the Fish Cypher Machines Appendix 12 in Copeland 2006, pp. 411–417 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Bennett, Ralph (1999) [1994], Behind the Battle: Intelligence in the war with Germany, 1939-1945 (New and Enlarged ed.), London: Random House, ISBN978-0712665216
Bertrand, Gustave (1973), Enigma ou la plus grand énigme de la guerre 1939–1945 (Enigma: The Greatest Enigma of the War of 1939–1945), Paris: Librairie Plon
Bloch, Gilbert (1987), "Enigma before Ultra: Polish Work and the French Contribution - Translated by C.A. Deavours", Cryptologia (published July 1987)
Brzezinski, Zbigniew (2005), Ciechanowski, Stanisław (ed.), Marian Rejewski, 1905-1980: living with the Enigma secret, The Unknown Victors, Bydgoszcz, Poland: Bydgoszcz City Council, pp. 15–18, ISBN83-7208-117-4
Budiansky, Stephen (2006), Colossus, Codebreaking, and the Digital Age in Copeland 2006, pp. 52–63 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Carter, Frank (2008), Codebreaking with the Colossus Computer, Bletchley Park Reports, vol. 1 (New ed.), Bletchley Park Trust, ISBN978-1-906723-00-2
Churchhouse, Robert (2002), Codes and Ciphers: Julius Caesar, the Enigma and the Internet, Cambridge: Cambridge University Press, ISBN978-0-521-00890-7
Copeland, Jack (2004), Copeland, B. Jack (ed.), The Essential Turing: Seminal Writings in Computing, Logic, Philosophy, Artificial Intelligence, and Artificial Life plus The Secrets of Enigma, ISBN0-19-825080-0
Copeland, Jack (2006), The German Tunny Machine in Copeland 2006, pp. 36–51 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Copeland, Jack (2006), Machine against Machine in Copeland 2006, pp. 64–77 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Copeland, Jack (2006), Colossus and the rise of the Modern Computer in Copeland 2006, pp. 101–115 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Copeland, Jack (2006), Turingery in Copeland 2006, pp. 378–385 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Cragon, Harvey G., From Fish to Colossus: How the German Lorenz Cipher was Broken at Bletchley Park (Cragon Books, Dallas, 2003; ISBN0-9743045-0-6) – A detailed description of the cryptanalysis of Tunny, and some details of Colossus (contains some minor errors)
Ćwięk, Henryk (2001), Przeciw Abwehrze (Against the Abwehr), Warsaw: Bellona, ISBN9788311091870
Dakin, Alec (1993) [1992], The Z Watch in Hut 4, Part I in Hinsley & Stripp 1993, pp. 50–56
DeBrosse, Jim; Burke, Colin (2004), The Secret in Building 26: The Untold Story of America's Ultra War Against the U-Boat Enigma Codes, Random House, ISBN978-0375508073
Edgerley, Peter (2006), The Testery and the Breaking of Fish in Copeland 2006, pp. 269–277 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Ellsbury, Graham (1998a), Description of the Enigma Machine, The Enigma Machine: Its Construction, Operation and Complexity (published 1998), retrieved 21 January 2009
Enever, Ted (1999), Britain's Best Kept Secret: Ultra's Base at Bletchley Park (3rd ed.), Gloucestershire: Sutton, ISBN978-07509-2355-2 – A guided tour of the history and geography of the Park, written by one of the founder members of the Bletchley Park Trust
Erskine, Ralph (2006), "The Poles Reveal their Secrets: Alastair Denniston's Account of the July 1939 Meeting at Pyry", Cryptologia, vol. 30, no. 4, pp. 294–305, doi:10.1080/01611190600920944, S2CID13410460
Erskine, Ralph; Smith, Michael, eds. (2011), The Bletchley Park Codebreakers, Biteback Publishing Ltd, ISBN978-184954078-0 Updated and extended version of Action This Day: From Breaking of the Enigma Code to the Birth of the Modern Computer Bantam Press 2001
Fensom, Harry (2006), How Colossus was built and Operated in Copeland 2006, pp. 297–304 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Ferris, John Robert (2005), Intelligence and strategy: selected essays (illustrated ed.), Routledge, ISBN9780415361941
Gaj, Kris; Orłowski, Arkadiusz, Facts and myths of Enigma: breaking stereotypes(PDF), George Mason University, Fairfax, VA 22030, U.S.A.; Institute of Physics, Polish Academy of Sciences Warszawa, Poland, retrieved 1 February 2009
Gannon, James (2002), Stealing Secrets, Telling Lies: How Spies and Codebreakers Helped Shape the Twentieth Century, Washington, D.C.: Brassey's, ISBN978-1574883671
Good, I. J., Pioneering Work on Computers at Bletchley (in Nicholas Metropolis, J. Howlett, Gian-Carlo Rota, (editors), A History of Computing in the Twentieth Century, Academic Press, New York, 1980)
Herivel, John (2008), Herivelismus and the German Military Enigma, Cleobury Mortimer, Shropshire: M & M Baldwin, ISBN978-0947712464 This contains an account of the pre-war work on Enigma in Poland, written with the care of a professional historian.
Hill, Marion (2004), Bletchley Park People, Stroud, Gloucestershire: The History Press, ISBN978-0-7509-3362-9
Hilton, Peter (2006), Living with Fish: Breaking Tunny in the Newmanry and the Testery in Copeland 2006, pp. 189–203 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Hinsley, F.H.; Ransom, C.F.G.; Knight, R.C.C. (1988), British Intelligence in the Second World War: Volume 3, Part 2: v. 3, Cambridge: Cambridge University Press, ISBN978-0521351966
Hinsley, F.H.; Stripp, Alan, eds. (1993) [1992], Codebreakers: The inside story of Bletchley Park, Oxford: Oxford University Press, ISBN978-0-19-280132-6
Kahn, David (1991), Seizing the Enigma: The Race to Break the German U-boat Codes, 1939-1943, New York: Houghton Mifflin Co., ISBN978-0395427392
Kahn, David (1996), The Codebreakers: The Comprehenisve History of Secret Communication from Ancient Times to the Internet, New York: Scribner, ISBN0684831309
Kenyon, David (16 July 2019), Bletchley Park and D-Day: The Untold Story of How the Battle for Normandy Was Won, Yale University Press, ISBN978-0-300-24357-4
Keen, John (2003), Harold 'Doc' Keen and the Bletchley Park Bombe, Cleobury Mortimer, Shropshire: M & M Baldwin, ISBN978-0-947712-42-6
Kozaczuk, Władysław (1984), 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 (2 ed.), Frederick, Maryland: University Publications of America, ISBN978-0890935477 A revised and augmented translation of W kręgu enigmy, Warsaw, Książka i Wiedza, 1979, supplemented with appendices by Marian Rejewski and others.
Kozaczuk, Władysław; Straszak, Jerzy (2004), Enigma: How the Poles Broke the Nazi Code, New York: Hippocrene Books, ISBN978-0781809412 Largely an abridgment of Kozaczuk 1984, minus Rejewski's appendices, which have been replaced with appendices of varying quality by other authors
Large, Christine (2003), Hijacking Enigma: The Insider's Tale, John Wiley, ISBN978-0470863466
Lewin, Ronald (2001) [1978], Ultra Goes to War: The Secret Story, Classic Military History (Classic Penguin ed.), London, England: Hutchinson & Co, ISBN978-1566492317
McKay, Sinclair (2010), The Secret Life of Bletchley Park: The WWII Codebreaking Centre and the men and women who worked there, London: Aurum Press, ISBN978-1-84513-539-3
Michie, Donald (2006), Codebreaking and Colossus in Copeland 2006, pp. 223–246 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Oakley, Brian, ed. (2006), The Bletchley Park War Diaries: July 1939 — August 1945 (2.6 ed.), Wynne Press
Parrish, Thomas (1986), The Ultra Americans: The U.S. Role in Breaking the Nazi Codes, New York: Stein and Day, ISBN0-8128-3072-5
Perera, Tom, Story of Enigma: History, Technology and Deciphering, Ian Allan Publishing, ISBN9780711035270
Putney, Diane T. (1987), ULTRA and the Army Air Forces in World War II: An Interview with Associate Justice of the U. S. Supreme Court Lewis F. Powell, USAF Warrior Studies, Washington, D. C.: Office of Air Force History United States Air Force, ISBN0-912799-45-5
Quirantes, Arturo. "Model Z: A Numbers-Only Enigma Version", Cryptologia 28(2), April 2004.
Randell, Brian, Colossus: Godfather of the Computer, 1977 (reprinted in The Origins of Digital Computers: Selected Papers, Springer-Verlag, New York, 1982)
Reeds, James A.; Whitfield, Diffie; Field, J.V. (2015). Breaking Teleprinter Ciphers at Bletchley Park An edition of: I.J Good, D. Michie, G. Timms: General report on Tunny: With Emphasis on Statistical Methods (1945). Wiley-IEEE Press. ISBN978-0-470-46589-9.
Rejewski, Marian (1942), Sprawozdanie z prac kryptologicznych nad niemieckim szyfrem maszynowym Enigma (Report of Cryptologic Work on the German Enigma Machine Cipher) (in Polish) Manuscript written at Uzès, France
Rejewski, Marian (1967), Wspomnienia z mej pracy w Biurze Szyfrów Oddziału II Sztabu Głównego 1932–1945 (Memoirs of My Work in the Cipher Bureau of Section II of the [Polish] General Staff) (in Polish) Manuscript
Rejewski, Marian (1982), "Remarks on Appendix 1 to British Intelligence in the Second World War by F.H. Hinsley," translated by Christopher Kasparek", Cryptologia, vol. 6, no. 1 (published January 1982), pp. 75–83, doi:10.1080/0161-118291856867
Rejewski, Marian (1984c), Summary of Our Methods for Reconstructing ENIGMA and Reconstructing Daily Keys, and of German Efforts to Frustrate Those Methods Appendix C of Kozaczuk 1984, pp. 241–245
Sale, Tony (2000), "The Colossus of Bletchley Park - The German Cipher System", in Rojas, Raúl; Hashagen, Ulf (eds.), The First Computers: History and Architecture, Cambridge, Massachusetts: The MIT Press, pp. 351–364, ISBN0-262-18197-5
Sale, Tony (2004) [1998], The Colossus Computer 1943–1996 and how it helped to break the German Lorenz cipher in WWII, Cleobury Mortimer: M & M Baldwin, ISBN0-947712-36-4
Singh, Simon (1999), The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography, London: Fourth Estate, ISBN1-85702-879-1
Small, Albert W. (December 1944), The Special Fish Report, The American National Archive (NARA) College Campus Washington{{citation}}: CS1 maint: date and year (link) CS1 maint: location missing publisher (link)
Smith, Michael (2000), The Emperor's Codes: Bletchley Park and the breaking of Japan's secret ciphers, Bantam Press, ISBN0593-046412
Smith, Michael (2006), "How it began: Bletchley Park Goes to War", in Copeland, B Jack (ed.), Colossus: The Secrets of Bletchley Park's Codebreaking Computers, Oxford: Oxford University Press, ISBN978-0-19-284055-4
Smith, Michael (2007) [1998], Station X: The Codebreakers of Bletchley Park, Pan Grand Strategy Series (Pan Books ed.), London: Pan McMillan Ltd, ISBN978-0-330-41929-1
Sullivan, Geoff; Weierud, Frode (2005), "Breaking German Army Ciphers"(PDF), Cryptologia, vol. 24, no. 3, pp. 193–232, retrieved 16 October 2008
Turing, Alan M. (1936), "On Computable Numbers, with an Application to the Entscheidungsproblem", Proceedings of the London Mathematical Society, 2, vol. 42 (published 1937), pp. 230–265, doi:10.1112/plms/s2-42.1.230 (and Turing, Alan M. (1938), "On Computable Numbers, with an Application to the Entscheidungsproblem. A correction", Proceedings of the London Mathematical Society, 2, vol. 43, no. 6 (published 1937), pp. 544–546, doi:10.1112/plms/s2-43.6.544)
Turing, Alan (c. 1941), "Memorandum to OP-20-G on Naval Enigma", in Copeland, B. Jack (ed.), The Essential Turing: Seminal Writings in Computing, Logic, Philosophy, Artificial Intelligence, and Artificial Life plus The Secrets of Enigma, Oxford: Oxford University Press, pp. 341–352, ISBN0-19-825080-0
Turing, Alan M. (1945), Report by Dr. A.M. Turing on proposals for the development of an Automatic Computing Engine (ACE): Submitted to the Executive Committee of the NPL in February 1946 reprinted in Copeland 2005, pp. 369–454
Tutte, William T. (2006), My Work at Bletchley Park Appendix 4 in Copeland 2006, pp. 352–369 harvnb error: multiple targets (5×): CITEREFCopeland2006 (help)
Welchman, Gordon (1997) [1982], The Hut Six story: Breaking the Enigma codes, Cleobury Mortimer, England: M&M Baldwin, ISBN9780947712341 New edition updated with an addendum consisting of a 1986 paper written by Welchman that corrects his misapprehensions in the 1982 edition.
Welchman, Gordon (1986), "From Polish Bomba to British Bombe: the Birth of Ultra", Intelligence and National Security, 1 (1), Ilford, England: Frank Cass & Company: 71–110, doi:10.1080/02684528608431842 This is reproduced as an addendum in the 1997 edition of Welchman's 'The Hut Six Story'.
Welchman, Gordon (2008) [1986], "From Polish Bomba to British Bombe: the Birth of Ultra", in Andrew, Christopher M. (ed.), Codebreaking and signals intelligence: Volume 1 of Intelligence and national security, The University of Virginia: F. Cass, ISBN9780714632995
Wells, B (2004), "A Universal Turing Machine Can Run on a Cluster of Colossi", Abstracts of the American Mathematical Society, 25: 441
Wenger, J. N. (1945), "Appendix II: U. S. Army Cryptanalytic Bombe", Solving the Enigma: History of the Cryptanalytic Bombe, a NSA phamphlet, retrieved 9 April 2010 (also National Archives and Records Administration Record Group 457, File 35701.)
Wilcox, Jennifer E (2001), "About the Enigma", Solving the Enigma: History of the Cryptanalytic Bombe, a NSA phamphlet, Center for Cryptologic History, National Security Agency, retrieved 9 April 2010 ASIN: B0006RLRA4
Woytak, Richard (1988), "Colonel Kowalewski and the Origins of Polish Code Breaking and Communication Interception", East European Quarterly, XXI (4), Boulder: University of Colorado: 497–500, ISSN0012-8449
Zuse, Konrad (2010) [1984], The Computer – My Life Translated by McKenna, Patricia and Ross, J. Andrew from: Der Computer, mein Lebenswerk (1984) (in English translated from German), Berlin/Heidelberg: Springer-Verlag, ISBN978-3-642-08151-4{{citation}}: CS1 maint: unrecognized language (link)