Não informado. (1961). Development Assistance. Organization for Economic Co-operation and Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Development Assistance. Paris: Organization for Economic Co-operation and Development, 1961.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Development Assistance. Organization for Economic Co-operation and Development, 1961.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.
