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References
- 1 2 "GCHQ's history told for the first time in Behind the Enigma". gchq.gov.uk. 20 October 2020. Retrieved 5 April 2021.
- 1 2 Harding, Luke (21 October 2020). "Behind the Enigma by John Ferris review – inside Britain's most secret intelligence agency". The Guardian. Retrieved 5 April 2021.
- ↑ FreedmanMarch/April 2021, Lawrence D. (2021-04-15). "A Review of "Behind the Enigma" by John Ferris". Foreign Affairs . ISSN 0015-7120 . Retrieved 2023-01-25.
- ↑ Urban, Mark. "Behind the Enigma by John Ferris, review — the not-so-super spies of GCHQ". The Times . ISSN 0140-0460 . Retrieved 2023-01-25.
- ↑ Marks, Philip (2023-01-16). "Review of Behind the Enigma by John Ferris". Cryptologia: 1–30. doi:10.1080/01611194.2022.2156311. ISSN 0161-1194. S2CID 256126968.
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