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Dyfyniad Arddull ChicagoRugman, Alan M. International Busienss: Firm and Environment. New York: McGraw Hill, 1985.
Dyfyniad MLARugman, Alan M. International Busienss: Firm and Environment. McGraw Hill, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.