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Dyfyniad Arddull ChicagoElifson, Kirk. Fundamentals of Social Statistics. 2nd.ed. Boston: McGraw-Hill, 1990.
Dyfyniad MLAElifson, Kirk. Fundamentals of Social Statistics. 2nd.ed. McGraw-Hill, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.