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Dyfyniad Arddull ChicagoBest, Joh. Research in Education. 4th. New Delhi: Prentice Hall, 1982.
Dyfyniad MLABest, Joh. Research in Education. 4th. Prentice Hall, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.