APA (7th ed.) Citation

Freedman, M. (2001). Unravelling Enigma: Winning the Code War at Station X (Repr.). Leo Cooper.

Chicago Style (17th ed.) Citation

Freedman, Maurice. Unravelling Enigma: Winning the Code War at Station X. Repr. Barnsley, South Yorkshire: Leo Cooper, 2001.

MLA (9th ed.) Citation

Freedman, Maurice. Unravelling Enigma: Winning the Code War at Station X. Repr. Leo Cooper, 2001.

Warning: These citations may not always be 100% accurate.