APA (7th ed.) Citation

Crowdy, T. (2006). The enemy within: A history of espionage (1. publ.). Osprey.

Chicago Style (17th ed.) Citation

Crowdy, Terry. The Enemy Within: A History of Espionage. 1. publ. Oxford [u.a.]: Osprey, 2006.

MLA (9th ed.) Citation

Crowdy, Terry. The Enemy Within: A History of Espionage. 1. publ. Osprey, 2006.