Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Organization of the Petroleum Exporting Countries. OPEC Bulletin. Vienna: OPEC.

Cita MLA (8a ed.)

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

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