Organisation for Economic Co-operation and Development & ProQuest (Firm). (2006). Environmental and energy products: The benefits of liberalising trade. OECD.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Organisation for Economic Co-operation and Development و ProQuest (Firm). Environmental and Energy Products: The Benefits of Liberalising Trade. Paris: OECD, 2006.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Organisation for Economic Co-operation and Development و ProQuest (Firm). Environmental and Energy Products: The Benefits of Liberalising Trade. OECD, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.