Organisation for Economic Co-operation and Development. (1983). Aid from OPEC countries: Efforts and policies of the members of OPEC and of the aid institutions established by OPEC countries. Organisation for Economic Co-operation and Development ; [OECD Publications and Information Center [distributor.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Organisation for Economic Co-operation and Development. Aid from OPEC Countries: Efforts and Policies of the Members of OPEC and of the Aid Institutions Established by OPEC Countries. Paris, France : .Washington, D.C: Organisation for Economic Co-operation and Development ; [OECD Publications and Information Center [distributor, 1983.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Organisation for Economic Co-operation and Development. Aid from OPEC Countries: Efforts and Policies of the Members of OPEC and of the Aid Institutions Established by OPEC Countries. Organisation for Economic Co-operation and Development ; [OECD Publications and Information Center [distributor, 1983.