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Dyfyniad Arddull ChicagoOakshott, Les. Essential Quantitative Methods. New York: Palgrave Macmillan, 2007.
Dyfyniad MLAOakshott, Les. Essential Quantitative Methods. Palgrave Macmillan, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.