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Dyfyniad Arddull ChicagoGottfried, Byron S. Spreadsheet Tools for Engineers: Excel 2000 Version. McGraw-Hill, 2007.
Dyfyniad MLAGottfried, Byron S. Spreadsheet Tools for Engineers: Excel 2000 Version. McGraw-Hill, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.