APA (7. basım) Alıntı

Organization of Petroleum Exporting Countries (OPEC). OPEC bulletin. Organization of the Petroleum Exporting Countries.

Chicago Style (17. basım) Atıf

Organization of Petroleum Exporting Countries (OPEC). OPEC Bulletin. Vienna, Austria: Organization of the Petroleum Exporting Countries.

MLA (9th ed.) Atıf

Organization of Petroleum Exporting Countries (OPEC). OPEC Bulletin. Organization of the Petroleum Exporting Countries.

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