Incoming Resources
- Hidden secrets, David Owen
- Secret spy skills, Christy Peterson
- Spy, written by Richard Platt
- How to tell a secret, tips, tricks, & techniques for breaking codes & conveying covert information, P.J. Huff & J.G. Lewin
- Wartime spies, Andrew Langley
- Top secret, spies, codes, capers, gadgets, and classified cases revealed, Crispin Boyer & Suzanne Zimbler
- Secret spy codes and messages, Christy Peterson
- The secret world of spy agencies, Susan K. Mitchell
- Ghosts of Honolulu, a Japanese spy, a Japanese American spy hunter, and the untold story of Pearl Harbor, Mark Harmon, Leon Carroll, Jr.
- Secret spy hacks, Christy Peterson
- Active measures, the secret history of disinformation and political warfare, Thomas Rid
- Spies, double agents, and traitors, Susan K. Mitchell
- A century of spies, intelligence in the twentieth century, Jeffrey T. Richelson
- How spies work, K.C. Kelley
- Spy gizmos and gadgets, Susan K. Mitchell
- Tales of spies, Edward G. Jerrome. --
- Spy tech--digital dangers, Susan K. Mitchell
- In the enemy's house, the secret saga of the FBI agent and the code breaker who caught the Russian spies, Howard Blum
- The new spymasters, inside the modern world of espionage from the Cold War to global terror, Stephen Grey