Mickael Smith, Central Intelligence Agency, Six: a History of Britain’s Secret Intelligence Service, Part 1 : " Murder and Mayhem, 1909—1939 " éditeur London, Dialogue, 2010, [1]Արխիվացված 2016-12-29 Wayback Machine
Mickael Smith, Central Intelligence Agency, Six: a History of Britain’s Secret Intelligence Service, Part 1 : " Murder and Mayhem, 1909—1939 " éditeur London, Dialogue, 2010, [1]Արխիվացված 2016-12-29 Wayback Machine