Held, G. (2002). Understanding data communications (7th ed.). Addison-Wesley.
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Dyfyniad Arddull Chicago
Held, Gilbert. Understanding Data Communications. 7th ed. New Delhi : Dorling Kindersley : Boston: Addison-Wesley, 2002.
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Dyfyniad MLA
Held, Gilbert. Understanding Data Communications. 7th ed. Addison-Wesley, 2002.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.