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Dyfyniad Arddull ChicagoWykstra, Ronald A. Education and the Economics of Human Capital. New York: Free Press, 1971.
Dyfyniad MLAWykstra, Ronald A. Education and the Economics of Human Capital. Free Press, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.