Não informado. (2009). Main Science and Technology Indicators. Organization for Economic Co-operation and Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Main Science and Technology Indicators. Paris: Organization for Economic Co-operation and Development, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Main Science and Technology Indicators. Organization for Economic Co-operation and Development, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.