Jack Copeland, editor, "Alan Turing's Automatic Computing Engine: The Master Codebreaker's Struggle to Build the Modern Computer", 2005, ISBN: 0198565933.
Jack Copeland (Editor) , "The Essential Turing", 2004, ISBN: 0198250800
Christof Teuscher, Alan Turing: Life and Legacy of a Great Thinker, 2003, ISBN: 3540200207
D Leavitt, The Man Who Knew Too Much -- Alan Turing and the Invention of the Computer, 2005, W W Norton & Co Ltd, ISBN 0393052362.
Jon Agar, Turing and the Universal Machine: The Making of the Modern Computer, 2001
Ray Spangenburg, Diane Kit Moser, "Alan Turing: The Troubled Genius of Bletchley Park Hall", 30 Nov 2007, ISBN 0816061750
Jack Copeland, editor, Colossus: The First Electronic Computer, January 30, 2005, Oxford University Press, ISBN 019284055X.
Anthony E. Sale. "The Rebuilding of Colossus at Bletchley Park," IEEE Annals of the History of Computing, vol. 27, no. 3, pp. 61-69, July-September 2005.
Paul Gannon, "Colossus: Bletchley Park's Greatest Secret", ISBN 1843543303.
Donald Michie, Colossus and the breaking of the wartime "fish" codes, Cryptologia, Jan 2002.
Erskine, Ralph. "The Admiralty and Cipher Machines During the Second World War: Not So Stupid after All." Journal of Intelligence History 2, no 2 (Winter 2002).
Ralph Erskine, "The Development of Typex", The Enigma Bulletin 2 (1997): pp69-86
Kruh and Deavours, "The Typex Cryptograph" Cryptologia 7(2), pp145–167, 1983
John R. Ferris, "The British 'Enigma': Britiain, Signal Security and Cipher Machines, 1906–1946.", Defense Analysis 3(2) (May 1987): pp153–163.
John Ferris, Intelligence and Strategy: Selected Essays, ISBN 041536194X, February 2005. Includes The British "enigma" : Britain, signals security and cipher machines, 1906-1953. "massively revised" version of 1987 paper.
Patrick Radden Keefe, Chatter: Dispatches from the Secret World of Global Eavesdropping, February 2005, ISBN 1400060346. (Menwith Hill)
Donald E. Mehl, Top Secret Communications of World War II: Unbreakable Encryption for Secret High-Level Conferences; SISALY - The Green Hornet: Secure Telephone Conferences; SIGTOT: Teletype Cryptographic System; The Beginning of the Digital Age. Raymore, MO: D.E. Mehl, 2002, [2].
Jak P. Mallmann Showell, German Naval Codebreakers (2003)
Hervie Haufler, Codebreaker's Victory: How the Allied Cryptographers Won World War II (2003)
JIM DEBROSSE, COLIN BURKE, The Secret in Building 26: The Untold Story of America's Ultra War Against the U-boat Enigma Codes (2003)
Stephen Budiansky, Battle of Wits: The Complete Story of Codebreaking in World War II
Wladyslaw Kozaczuk, Jerzy Straszak Enigma: How the Poles Broke the Nazi Code (Polish Histories)
Kenneth MacKsey, Without Enigma: The Ultra & Fellgiebel Riddles
Tessa Stirling, Dria Nalecz and Tadeusz Dubicki, "Vol. I: the Report of the Anglo-Polish Historical Committee" Intelligence Co-operation between Poland and Great Britain during World War II, London, Vallentine Mitchell, 2005. ISBN 0-85303-656-X.
Stephen E. Ambrose, Eisenhower and the Intelligence Community in World War II, Journal of Contemporary History, Vol. 16, No. 1, The Second World War: Part 1 (Jan., 1981) , pp. 153-166
J. V. Boone, A Brief History of Cryptology, 2005, ISBN 1591140846
James Gannon, Stealing Secrets, Telling Lies: How Spies & Codebreakers Helped Shape the Twentieth Century, 2001, ISBN 1574883674.
Kenneth Macksey, The Searchers: How Radio Interception Changed the Course of Both World Wars, 2004, ISBN 030436651X.
Irene Young, Enigma Variations: Love, War and Bletchley Park, 2000, ISBN 1840183772
Mark Urban, The Man Who Broke Napoleon's Codes, 2002, ISBN 0060934557.
R.A. Ratcliff, Delusions of Intelligence: Enigma, Ultra, and the End of Secure Ciphers, Hardcover, 280 pages (May 31, 2006), Cambridge University Press, ISBN 0521855225[3].
