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Dyfyniad Arddull ChicagoSommerville, Ian. Software Engineering. Harlow, Eng: Addison-Wesley, 2001.
Dyfyniad MLASommerville, Ian. Software Engineering. Harlow, Eng: Addison-Wesley, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.