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Dyfyniad Arddull Chicago- and Gene Steinberg. Upgrading & Troubleshooting Your Mac. McGraw-Hill, 1999.
Dyfyniad MLA- and Gene Steinberg. Upgrading & Troubleshooting Your Mac. McGraw-Hill, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.