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Dyfyniad Arddull ChicagoSmith, David Eugene. Quantative Business Analysis. SANTA BARBARA: John Wiley, 1977.
Dyfyniad MLASmith, David Eugene. Quantative Business Analysis. John Wiley, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.