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Dyfyniad Arddull ChicagoGupta, S P. Statistical Methods. 28. New Delhi: Sulthan Chand and Sons, 2000.
Dyfyniad MLAGupta, S P. Statistical Methods. 28. Sulthan Chand and Sons, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.