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Dyfyniad Arddull ChicagoGordon, Edmund W., et al. Review of Research in Education. Washington, D.C.: American Educational Research Association, 1983.
Dyfyniad MLAGordon, Edmund W., et al. Review of Research in Education. American Educational Research Association, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.