Incoming Resources
- Coffee with Hitler, the untold story of the amateur spies who tried to civilize the Nazis, Charles Spicer
- Battle of wits, the complete story of codebreaking in World War II, Stephen Budiansky
- World War II spies, an interactive history adventure, by Michael Burgan
- The secret war with Germany, deception, espionage, and dirty tricks, 1939-1945, William B. Breuer