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Dyfyniad Arddull ChicagoField, Andy. Discovering Statistics Using IBM SPSS Statistics. 5th edition. New Delhi: Sage, 2018.
Dyfyniad MLAField, Andy. Discovering Statistics Using IBM SPSS Statistics. 5th edition. Sage, 2018.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.