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Dyfyniad Arddull ChicagoMedia Economics, Theory and Practice, Second Edition. Lawrence Erlbaum Associates, Publisher, 1998.
Dyfyniad MLAMedia Economics, Theory and Practice, Second Edition. Lawrence Erlbaum Associates, Publisher, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.