Supplementary Protocols between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the United States of America, amending the Convention for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with respect to Taxes on Income, signed at Washington on April 16, 1945, as modified by the Supplementary Protocols signed at Washington on June 6, 1946, May 25, 1954 and Aug 19, 1957. Washington, March 17, 1966.
Great Britain.Foreign Office,issuing body.
Great Britain.Her Majesty's Stationery Office.