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Dyfyniad Arddull ChicagoRobison, J. Vincent. Modern Algebra and Trigonometry. New York: McGraw-Hill, 1966.
Dyfyniad MLARobison, J. Vincent. Modern Algebra and Trigonometry. McGraw-Hill, 1966.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.