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Dyfyniad Arddull ChicagoChiswick, Barry R., and Paul W. Miller. The Economics of Language: International Analyses. 1a. ed. Londres: Routledge, 2007.
Dyfyniad MLAChiswick, Barry R., and Paul W. Miller. The Economics of Language: International Analyses. 1a. ed. Routledge, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.