Bath, A.H. (1998) Tracking the Axis Enemy: The Triumph of Anglo-American Naval Intelligence. University Press of Kansas. [] Amazon.com or Amazon.co.uk
Beesly, P. (2000) Very Special Intelligence. Greenhill Books. [Re-issued standard text.] Amazon.com or Amazon.co.uk
Bray, J.K. (1996) Ultra in the Atlantic: Allied Communications Intelligence and the Battle of the Atlantic. Aegean Park. Amazon.com
Budiansky, S. (2000) Battle of Wits: The Complete Story of Codebreaking in World War II. Viking. Amazon.com or Amazon.co.uk
Enever, T. (1999) Britain's Best Kept Secret: Ultra's Base at Bletchley Park. Sutton Publishing. Amazon.co.uk
Gardner, W.J.R. (1999) Decoding History: The Battle of the Atlantic and Ultra. Naval Institute Press. Amazon.com
Harper, S. (1999) Capturing Enigma. Sutton Publishing. [The incredible story of how HMS Petard and her gallant crew seized priceless German Enigma code-books from a sinking U-boat - one of the last great untold stories of the Second World War.] Amazon.co.uk
Harris, A. (1998) Tracking the Axis Enemy: The Triumph of Anglo-American Naval Intelligence. Univ. Press of Kansas. [Former naval intelligence officer recounts the contribution of the allied intelligence services during the Battle of the Atlantic.] Amazon.com or Amazon.co.uk
Harris, R. (1996) Enigma. Arrow. [Best-selling novel about the U-boat codebreakers based at Bletchley Park in England]. Amazon.com or Amazon.co.uk. Audiobook versions are also stocked by Amazon.com (narrated by Alan Howard), Amazon.co.uk (unabridged version narrated by Stephen Thorne) and Amazon.co.uk (abridged version).
Hinsley, F.H. (1993) British Intelligence in the Second World War (Abridged). Cambridge Univ Pr. Amazon.com or Amazon.co.uk
Hinsley, F.H. & Stripp, A. (eds.) (1994) Codebreakers: The Inside Story of Bletchley Park. Oxford Univ Pr. [Bletchley Park was arguably the most successful intelligence operation in world history, the top secret workplace of the remarkable people who cracked Germany's vaunted Enigma Code. This fascinating book gathers together 27 first-hand accounts, written by members of the codebreakers team.] Amazon.com or Amazon.co.uk
Howse, H.D. (1993) Radar at Sea: The Royal Navy in World War 2. United States Naval Inst. Amazon.com or Amazon.co.uk
Kahn, D. (1991) Seizing the Enigma: The Race to Break the German U-Boat codes, 1939-1943. Houghton Mifflin. Amazon.com or Amazon.co.uk
Kahn, D. (1996) The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet. Scribner. [Includes coverage of the Battle of the Atlantic and the allies' quest to decode Enigma.] Amazon.com or Amazon.co.uk
Kohnen, D. (1999) Commanders Winn and Knowles: Winning the U-Boat War with Intelligence 1939-1943. Enigma Press. Amazon.com
Poolman, K. (1997) The Winning Edge: Naval Technology in Action 1939-1945. Alan Sutton. Amazon.com or Amazon.co.uk
Sale, T. (1998) The Colossus Computer 1943-1996. M & M Baldwin. Amazon.co.uk
Sebag-Montefiore, H. (2000) Enigma: The Battle for the Code. [Charts the history of Enigma from the early thirties through to the wartime Codebreaking at Bletchley Hall in the UK.] Amazon.com or Amazon.co.uk
Showell, J.M. (2000) Enigma U-boats: Breaking the Code. Ian Allan. Amazon.com or Amazon.co.uk
Singh, S. (1999) The Code Book: The Evolution of Secrecy from Mary, Queen of Scots to Quantum Cryptography. Doubleday. [Best-selling book about codes and codebreaking with coverage of German Enigma code in WW2.] Amazon.com or Amazon.co.uk
Smith, M. (1998) Station X: The Codebreakers of Bletchley Park. Channel 4. [Companion book to fascinating Channel 4 series about the collection of eccentrics based in the British countryside who broke the German Enigma codes, to devastating effect.] Amazon.com or Amazon.co.uk
Smith, M. (2000) The Emperor's Codes. Bantam Press. [Author of Station X describes the cracking of Japanese codes.] Amazon.com or Amazon.co.uk
Stephenson, N. (1999) Cryptonomicon. Avon Books. [Best-selling novel which recounts "the tale of a World War II code breaker whose descendants end up trying to track down the secrets of the Third Reich's cryptographers--secrets that may liberate or ruin the cybertech world of the present day".] Amazon.com or Amazon.co.uk. An audio version is also available from Amazon.com
Strathern, P. (1997) The Big Idea: Turing and the Computer. Arrow. [Turing was heavily involved in WW2 U-boat codebreaking, and in doing this became the 'father' of modern computing.] Amazon.com or Amazon.co.uk
Welchman, G. (1997) The Hut Six Story: Breaking the Enigma Codes. M & M Baldwin. Amazon.com or Amazon.co.uk
Williams, K.B. (1996) Secret Weapon: U.S. High-Frequency Direction Finding in the Battle of the Atlantic. Naval Institute Press. Amazon.com or Amazon.co.uk
Winterbotham, F.W. (1999) The Ultra Secret. Weidenfeld & Nicolson. Amazon.co.uk.
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Lewin, R. (2001) Ultra Goes to War. Penguin. 
