Oakley, B. (2011). The first break into German Enigma at Bletchley Park: [This booklet, which is based upon a Bletchley Park Lecture, ia an extended version of the origins of the first real break into the Enigma by the Poles and then further breaks at Bletchley Park] (New ed.). Bletchley Park Trust.
Chicago-Zitierstil (17. Ausg.)Oakley, Brian. The First Break into German Enigma at Bletchley Park: [This Booklet, Which Is Based upon a Bletchley Park Lecture, Ia an Extended Version of the Origins of the First Real Break into the Enigma by the Poles and Then Further Breaks at Bletchley Park]. New ed. Milton Keynes: Bletchley Park Trust, 2011.
MLA-Zitierstil (9. Ausg.)Oakley, Brian. The First Break into German Enigma at Bletchley Park: [This Booklet, Which Is Based upon a Bletchley Park Lecture, Ia an Extended Version of the Origins of the First Real Break into the Enigma by the Poles and Then Further Breaks at Bletchley Park]. New ed. Bletchley Park Trust, 2011.