Notes

Bibliography

Tony Sale, "Codes and Ciphers in the Second World War," http://www.codesandciphers.org.uk/index.htm (The Big Oxford Computer Company Limited, accessed 2004 Sep 24). This has links to copies of several original World War II documents.

Tony Sale, "The Colossus: Its Purpose and Operation," http://www.codesandciphers.org.uk/lorenz/colossus.htm (The Big Oxford Computer Company Limited, accessed 2004 Sep 24).