Incoming Resources
- Spies!, the history of secret agents and double-crossers
- The second oldest profession, a world history of espionage, Jeffrey Burds, Part one
- Breve historia del espionaje, Juan Carlos Herrera Hermosilla
- Double agents, espionage, literature, and liminal citizens, Erin G. Carlston
- The Big Book of Spy Trivia, Spy Stories, Secret Agent Facts, and Espionage Skills from History's Greatest Covert Missions
- HUNDRED YEARS OF SPYING
- The anatomy of a spy, a history of espionage and betrayal, Michael Smith
- Hundred years of spying