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Dyfyniad Arddull ChicagoRos Jay. Marketing On a Budget. London,Boston: International Thomson Pub. Europe, 1998.
Dyfyniad MLARos Jay. Marketing On a Budget. London,Boston: International Thomson Pub. Europe, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.