Incoming Resources
- Secret messages, concealment, codes, and other types of ingenious communication, William S. Butler and L. Douglas Keeney
- Codes, ciphers, and cartography, math goes to war, Terry Burrows
- Safe, Lionsgate and IM Global present ; in association with Automatik ; produced by Lawrence Bender, Dana Brunetti ; written and directed by Boaz Yakin
- The Bletchley circle, cracking a killer's code, PBS ; director
- The book of codes, understanding the world of hidden messages : an illustrated guide to signs, symbols, ciphers, and secret languages, Paul Lunde, general editor