Barnes, A. (2022). EU Commission proposal for joint gas purchasing, price caps and collective allocation of gas: An assessment. Oxford Institute for Energy Studies.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Barnes, A. EU Commission Proposal for Joint Gas Purchasing, Price Caps and Collective Allocation of Gas: An Assessment. Oxford Institute for Energy Studies, 2022.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Barnes, A. EU Commission Proposal for Joint Gas Purchasing, Price Caps and Collective Allocation of Gas: An Assessment. Oxford Institute for Energy Studies, 2022.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.