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Dyfyniad Arddull ChicagoR.J.Deasington. X.25 Explained: Protocols for Packet Switching Networks. John Wiley and Sons, 1986.
Dyfyniad MLAR.J.Deasington. X.25 Explained: Protocols for Packet Switching Networks. John Wiley and Sons, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.