Incoming Resources
- Top secret, a handbook of codes, ciphers, and secret writing, Paul B. Janeczko ; illustrated by Jenna LaReau
- Creating and cracking codes, Lesley McFadzean
- Navajo code talkers, by Andrew Santella
- Pass it on!, all about notes, from secret codes and special inks to fancy folds and dead man's drops, by Sharon Bailly ; illustrations by Anne Canevari Green
- Breaking secret codes, by Jillian Gregory
- The Montefeltro conspiracy, a Renaissance mystery decoded, by Marcello Simonetta
- Secret messages, concealment, codes, and other types of ingenious communication, William S. Butler and L. Douglas Keeney
- Codes and sequences, by Marion Smoothey ; illustrated by Ann Baum
- Unsung heroes of world war II, the story of the Navajo code talkers, Deanne Durrett