United Nations Industrial Development Organization. (1975). Guidelines for contracting for industrial projects in developing countries. United Nations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United Nations Industrial Development Organization. Guidelines for Contracting for Industrial Projects in Developing Countries. New York: United Nations, 1975.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)United Nations Industrial Development Organization. Guidelines for Contracting for Industrial Projects in Developing Countries. United Nations, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.