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Dyfyniad Arddull ChicagoHeal,Geoffrey. The Economics of Increasing Returns. U K: Edward Elgar, 1999.
Dyfyniad MLAHeal,Geoffrey. The Economics of Increasing Returns. Edward Elgar, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.