deGeorg Jellinek, Die Lehre von den Staatenverbindungen [The Theory of the Unifications of States] (Berlin: Verlag von O. Haering 1882), p. 208 ff.
thegazette.co.uk
Almeric Fitzroy, Clerk of the Privy Council, “The Titles Deprivation Act, 1917”, The London Gazette, Her Majesty's Stationery Office, London, England, 28 March 1919, Issue No 31255, page 4000