ebrary, Inc. (2007). International petroleum encyclopedia. PennWell Pub..
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Dyfyniad Arddull Chicago
ebrary, Inc. International Petroleum Encyclopedia. Tulsa, OK: PennWell Pub., 2007.
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Dyfyniad MLA
ebrary, Inc. International Petroleum Encyclopedia. PennWell Pub., 2007.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.