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Dyfyniad Arddull ChicagoStein, Robert G. Mathematics: An Exploratory Approach. New York: McGraw-Hill, 1975.
Dyfyniad MLAStein, Robert G. Mathematics: An Exploratory Approach. New York: McGraw-Hill, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.