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Dyfyniad Arddull Chicagoebrary, Inc, and Robin Waterfield. The First Philosophers: The Presocratics and Sophists. Oxford ; New York: Oxford University Press, 2000.
Dyfyniad MLAebrary, Inc, and Robin Waterfield. The First Philosophers: The Presocratics and Sophists. Oxford University Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.