Title: Security and Special Operations: SOE and MI5 During the Second World War, Author: C. Murphy
Title: Spies in the Empire: Victorian Military Intelligence, Author: Stephen Wade
Title: Colossus: The secrets of Bletchley Park's code-breaking computers, Author: B. Jack Copeland
Title: The Guy Liddell Diaries: 1939-1942, Mi5's Director of Counter-Espionage in World War II, Author: Nigel West
Title: Elizabethan Fictions (Oxford English Monographs Series): Espionage, Counter-Espionage and the Duplicity of Fiction in Early Elizabethan Prose Narratives, Author: R. W. Maslen