Great Britain & Great Britain. Foreign Office. (1962). Agreement between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Republic of Sudan for air services between and beyond their respective territories: Khartoum, January 16, 1961. H.M.S.O..

Great Britain and Great Britain. Foreign Office. Agreement Between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Republic of Sudan for Air Services Between and Beyond Their Respective Territories: Khartoum, January 16, 1961. London: H.M.S.O., 1962.

Great Britain and Great Britain. Foreign Office. Agreement Between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Republic of Sudan for Air Services Between and Beyond Their Respective Territories: Khartoum, January 16, 1961. H.M.S.O., 1962.