APA (7th ed.) Citation

(1999). Organization of Petroleum Exporting Countries (OPEC), 1973. Maps.com.

Chicago Style (17th ed.) Citation

Organization of Petroleum Exporting Countries (OPEC), 1973. [S.l.]: Maps.com, 1999.

MLA (9th ed.) Citation

Organization of Petroleum Exporting Countries (OPEC), 1973. Maps.com, 1999.

Warning: These citations may not always be 100% accurate.