Unesco. (1989). World communication report. UNESCO.
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Dyfyniad Arddull Chicago
Unesco. World Communication Report. Paris: UNESCO, 1989.
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Dyfyniad MLA
Unesco. World Communication Report. UNESCO, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.