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Dyfyniad Arddull ChicagoRogers, Patricia N. JTEC Program Summary. Baltimore: International Technology Research Institute, 1991.
Dyfyniad MLARogers, Patricia N. JTEC Program Summary. Baltimore: International Technology Research Institute, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.