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Dyfyniad Arddull ChicagoSiever, Raymond. Sand. New York: Scientific American Library Distributed by W.H. Freeman, 1988.
Dyfyniad MLASiever, Raymond. Sand. Scientific American Library Distributed by W.H. Freeman, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.