United Nations. Department of International Economic and Social Affairs. Statistical Office. (1980). Improvement of statistics on the outflow of trained personnel from developing to developed countries: A technical report. United Nations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United Nations. Department of International Economic and Social Affairs. Statistical Office. Improvement of Statistics on the Outflow of Trained Personnel from Developing to Developed Countries: A Technical Report. New York: United Nations, 1980.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)United Nations. Department of International Economic and Social Affairs. Statistical Office. Improvement of Statistics on the Outflow of Trained Personnel from Developing to Developed Countries: A Technical Report. United Nations, 1980.