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Dyfyniad Arddull ChicagoHuman Computer Interaction Alan Dix ... [et Al.]. Prentice-Hall, 1993.
Dyfyniad MLAHuman Computer Interaction Alan Dix ... [et Al.]. Prentice-Hall, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.