Bletchley Park and D-Day : the untold story of how the battle for Normandy was won

Kenyon, David, author.
New Haven ; London : Yale University Press, [2019]

Churchill's Secret War.

Denniston, Robin.
The History Press, 2016.

Codebreakers : Images of the national archives

Twigge, Stephen Robert, 1962- author.
Yorkshire ; Philadelphia : Pen & Sword History, an imprint of Pen & Sword Books Ltd, 2020.

Colossus : the secrets of Bletchley Park's codebreaking computers

Oxford ; New York : Oxford University Press, 2006.

Decoding Organization : Bletchley Park, Codebreaking and Organization Studies.

Grey, Christopher, 1964-
Cambridge : Cambridge University Press, 2012.

Delusions of intelligence : Enigma, Ultra and the end of secure ciphers

Ratcliff, R. A. (Rebecca Ann), 1963-
Cambridge ; New York : Cambridge University Press, 2006.

Lorenz : breaking Hitler's top secret code at Bletchley Park

Roberts, Jerry (Captain), author.
Stroud : The History Press, 2017.