Gordon Welchman: Bletchley Park’s Architect of Ultra Intelligence
The Puzzle Palace: Inside the National Security Agency, America's Most Secret Intelligence Organization
My Secret Life in Hut Six: One Woman's Experiences at Bletchley Park
The Ultra Secret
The Secret Life of Bletchley Park: The WWII Codebreaking Centre and the Men and Women Who Worked There
The Secret Lives of Codebreakers: The Men and Women Who Cracked the Enigma Code at Bletchley Park
Bletchley Park: The Secret Archives