History of the Second World War
H.M.S.O
by F. H. Hinsley and C. A. G. Simkins
Her Majesty's Stationery Office 1990 History of the Second World War . British intelligence in the Second World War ; v. 4
Available at 1 libraries
by Michael Howard
H.M.S.O. 1990 History of the Second World War . British intelligence in the Second World War ; v. 5