Unravelling Enigma winning the Code War at Station X - Freedman, Maurice (Leo Cooper, 2001)
Includes bibliographical references (p. 185-186) and index
Keywords: Geschichte; Weltkrieg (1939-1945); Enigma cipher system; World War, 1939-1945 -- Cryptography; World War, 1939-1945 -- Military intelligence -- Great Britain; Dechiffrierung; Enigma -- Chiffriermaschine; Großbritannien