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Dyfyniad Arddull ChicagoChristensen, Larry B. Experimental Methodology. 8th ed. Boston: Allyn & Bacon, 2001.
Dyfyniad MLAChristensen, Larry B. Experimental Methodology. 8th ed. Allyn & Bacon, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.