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Dyfyniad Arddull ChicagoDesfry, Philippe. Object Engineering: The Fourth Dimension. California: Addison Wesley, 1994.
Dyfyniad MLADesfry, Philippe. Object Engineering: The Fourth Dimension. Addison Wesley, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.