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Dyfyniad Arddull ChicagoFara, Patricia. Science: A Four Thousand Year History. Oxford ; New York: Oxford University Press, 2009.
Dyfyniad MLAFara, Patricia. Science: A Four Thousand Year History. Oxford University Press, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.