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Dyfyniad Arddull ChicagoAmerican Institute of Chemical Engineers, Bruce L. Bates, and Howard Kehde. C₄ Hydrocarbon Production and Distribution. New York: American Institute of Chemical Engineers, 1970.
Dyfyniad MLAAmerican Institute of Chemical Engineers, et al. C₄ Hydrocarbon Production and Distribution. American Institute of Chemical Engineers, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.