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Dyfyniad Arddull ChicagoJohnson, W. Engineering Plasticity. London: Van Nostrand Reinhold Company, 1978.
Dyfyniad MLAJohnson, W. Engineering Plasticity. Van Nostrand Reinhold Company, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.