Great Britain & Great Britain. Foreign and Commonwealth Office. (1981). Agreement between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the democratic Republic of the Sudan on certain commercial debts. Khartoum, 25 August 1980. H.M.S.O..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Great Britain و 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 Republic of the Sudan on Certain Commercial Debts. Khartoum, 25 August 1980. London: H.M.S.O., 1981.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Great Britain و 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 Republic of the Sudan on Certain Commercial Debts. Khartoum, 25 August 1980. H.M.S.O., 1981.