(2019). ... OPEC annual statistical bulletin. Organization of the Petroleum Exporting Countries.
Chicago Style (17th ed.) Citation... OPEC Annual Statistical Bulletin. Vienna, Austria: Organization of the Petroleum Exporting Countries, 2019.
MLA (9th ed.) Citation... OPEC Annual Statistical Bulletin. Organization of the Petroleum Exporting Countries, 2019.
Warning: These citations may not always be 100% accurate.