Incoming Resources
- Top secret, a handbook of codes, ciphers, and secret writing, Paul B. Janeczko ; illustrated by Jenna LaReau
- The book of codes, understanding the world of hidden messages : an illustrated guide to signs, symbols, ciphers, and secret languages, Paul Lunde, general editor
- Who were the Navajo code talkers?, by James Buckley, Jr. ; illustrated by Gregory Copeland
- The secret war, by Francis Russell and the editors of Time-Life Books
- Code girls, the untold story of the American women code breakers of World War II, Liza Mundy