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