Sottas, E. (1985). The least developed countries: An introduction to the LCDs and to the substantial new programme of action for them. United Nations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sottas, Eric. The Least Developed Countries: An Introduction to the LCDs and to the Substantial New Programme of Action for Them. New York, N. Y: United Nations, 1985.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Sottas, Eric. The Least Developed Countries: An Introduction to the LCDs and to the Substantial New Programme of Action for Them. United Nations, 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.