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Dyfyniad Arddull ChicagoLindgren, Henry Clay. Educational Psychology in the Classroom. 5th ed. New York: John Wiley, 1976.
Dyfyniad MLALindgren, Henry Clay. Educational Psychology in the Classroom. 5th ed. John Wiley, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.