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Dyfyniad Arddull ChicagoWiersma, William. Research Methods in Education: An Introduction. 3rd ed., rev. print. Boston: Allyn and Bacon, 1985.
Dyfyniad MLAWiersma, William. Research Methods in Education: An Introduction. 3rd ed., rev. print. Allyn and Bacon, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.