Notes
- Hinsley , F.H. 1979 . British Intelligence in the Second World War Vol. I , 314 London
- McLachlan , Donald . 1968 . Room 39 220 New York
- Beesly , Patrick . 1980 . Very Special Admiral 180 – 84 . London
- Hyde , H. Montgomery . 1962 . Room 3603 52 – 4 . New York