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Dyfyniad Arddull ChicagoBurrell, Robert Coleman. Copyright Exceptions: The Digital Impact. Cambridge: Cambridge University press, 2005.
Dyfyniad MLABurrell, Robert Coleman. Copyright Exceptions: The Digital Impact. Cambridge University press, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.