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Dyfyniad Arddull ChicagoRalston, Anthony. Encyclopedia of Computer Science. New York: Van Nostrand Renhold Company, 1976.
Dyfyniad MLARalston, Anthony. Encyclopedia of Computer Science. New York: Van Nostrand Renhold Company, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.