Organization of Petroleum Exporting Countries. OPEC review. Organization of the Petroleum Exporting Countries.
Cita Chicago Style (17a ed.)Organization of Petroleum Exporting Countries. OPEC Review. Vienna [Austria]: Organization of the Petroleum Exporting Countries.
Cita MLA (8a ed.)Organization of Petroleum Exporting Countries. OPEC Review. Organization of the Petroleum Exporting Countries.
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