Organisation for Economic Co-operation and Development. (1972). Classification of educational systems in OECD member countries. Organisation for Economic Co-operation and Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Organisation for Economic Co-operation and Development. Classification of Educational Systems in OECD Member Countries. Paris: Organisation for Economic Co-operation and Development, 1972.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Organisation for Economic Co-operation and Development. Classification of Educational Systems in OECD Member Countries. Organisation for Economic Co-operation and Development, 1972.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.