Cita APA (7th ed.)
ebrary, Inc. (2007). International petroleum encyclopedia. PennWell Pub..
Cita Chicago (17th ed.)
ebrary, Inc. International Petroleum Encyclopedia. Tulsa, OK: PennWell Pub., 2007.
Cita MLA (9th ed.)
ebrary, Inc. International Petroleum Encyclopedia. PennWell Pub., 2007.
Atenció: Aquestes cites poden no estar 100% correctes.