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Dyfyniad Arddull ChicagoCole, John. The Geography of the European Community. London: Routledge, 1993.
Dyfyniad MLACole, John. The Geography of the European Community. London: Routledge, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.