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..
Παραπομπή σε μορφή Chicago (17η εκδ.)Great Britain και 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.
Παραπομπή σε μορφή MLA (8th εκδ.)Great Britain και 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.