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Dyfyniad Arddull ChicagoThe Telecommunication Industry: Growth and Structural Change. New York: United Nations, 1987.
Dyfyniad MLAThe Telecommunication Industry: Growth and Structural Change. New York: United Nations, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.