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Dyfyniad Arddull ChicagoQuayle, J P Ed. by. Kempe's Engineering Yearbook,1983. London: Morgan - Grampian, 1984.
Dyfyniad MLAQuayle, J P Ed. by. Kempe's Engineering Yearbook,1983. Morgan - Grampian, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.