Organisation for Economic Co-operation and Development. (2020). OECD statistics on international trade in services: Detailed tables by service category, 2014-2018. OECD.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Organisation for Economic Co-operation and Development. OECD Statistics on International Trade in Services: Detailed Tables by Service Category, 2014-2018. Paris: OECD, 2020.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Organisation for Economic Co-operation and Development. OECD Statistics on International Trade in Services: Detailed Tables by Service Category, 2014-2018. OECD, 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.