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Dyfyniad Arddull ChicagoInternational Journal of Technology and Design Education. Dordrecht, the Netherlands: Kluwer Academic Publishers, 1990.
Dyfyniad MLAInternational Journal of Technology and Design Education. Kluwer Academic Publishers, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.