United Nations Industrial Development Organization, Giersig, F., & Matthews, S. R. (1975). Guidelines for contracting for industrial projects in developing countries. United Nations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United Nations Industrial Development Organization, Friedrich Giersig, و Stuart R. Matthews. Guidelines for Contracting for Industrial Projects in Developing Countries. New York: United Nations, 1975.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United Nations Industrial Development Organization, et al. Guidelines for Contracting for Industrial Projects in Developing Countries. United Nations, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.