Society of Petroleum Engineers. (1997). Drilling fluids. Society of Petroleum Engineers.
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Dyfyniad Arddull Chicago
Society of Petroleum Engineers. Drilling Fluids. Texas: Society of Petroleum Engineers, 1997.
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Dyfyniad MLA
Society of Petroleum Engineers. Drilling Fluids. Society of Petroleum Engineers, 1997.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.