United States. Energy Information Administration. OPEC revenues fact sheet. Energy Information Administration.
Chicago Style (17th ed.) CitationUnited States. Energy Information Administration. OPEC Revenues Fact Sheet. [Washington, D.C.]: Energy Information Administration.
MLA (9th ed.) CitationUnited States. Energy Information Administration. OPEC Revenues Fact Sheet. Energy Information Administration.
Warning: These citations may not always be 100% accurate.