Great Britain & Great Britain. Foreign and Commonwealth Office. (1980). Agreement between the government of the United Kingdom of Great Britain and Northern Ireland and the government of the Democratic Socialist Republic of Sri Lanka for the promotion and protection of investments: Colombo, 13 February 1980 (instruments of ratification have not been exchanged). H.M.S.O..
Παραπομπή σε μορφή Chicago (17η εκδ.)Great Britain και Great Britain. Foreign and Commonwealth Office. Agreement Between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Democratic Socialist Republic of Sri Lanka for the Promotion and Protection of Investments: Colombo, 13 February 1980 (instruments of Ratification Have Not Been Exchanged). London: H.M.S.O., 1980.
Παραπομπή σε μορφή MLA (8th εκδ.)Great Britain και Great Britain. Foreign and Commonwealth Office. Agreement Between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Democratic Socialist Republic of Sri Lanka for the Promotion and Protection of Investments: Colombo, 13 February 1980 (instruments of Ratification Have Not Been Exchanged). H.M.S.O., 1980.