Editing Typex (section)

== General and cited references ==
* [[Martin Campbell-Kelly]], ''ICL: A Business and Technical History'', [[Oxford University Press]], 1990.
* Dorothy Clarkson, "Cypher Machines: Maintenance and Restoration Spanning Sixty Years", ''Cryptologia'', 27(3), July 2003, pp.&nbsp;209–212.
* Cipher A. Deavours and Louis Kruh, "Machine Cryptography and Modern Cryptanalysis", Artech House, 1985, pp.&nbsp;144–145; 148–150.
* Ralph Erskine, "The Admiralty and Cipher Machines During the Second World War: Not So Stupid after All". ''Journal of Intelligence History'' 2(2) (Winter 2002).
* Ralph Erskine, "The Development of Typex", ''The Enigma Bulletin'' 2 (1997): pp.&nbsp;69–86
* Kruh and Deavours, "The Typex Cryptograph" Cryptologia 7(2), pp.&nbsp;145–167, 1983
* Eric Morgon, "The History of Communications Security in New Zealand", Part 1 [https://web.archive.org/web/20061004041222/http://www.gcsb.govt.nz/infosec/infos_hist.pdf (PDF)].[https://web.archive.org/web/20111112144636/http://www.gcsb.govt.nz/about-us/history-ia.html Possibly related page as html]