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Dyfyniad Arddull ChicagoSzekely, Julian. The Steel Industry and the Energy Crisis. New York: Marcel Dekker, 1975.
Dyfyniad MLASzekely, Julian. The Steel Industry and the Energy Crisis. New York: Marcel Dekker, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.