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Dyfyniad Arddull ChicagoHURST C.C. THE MECHANISM OF CREATIVE EVOLUTION. I. USA: CAMBRIDGE UNIVERSITY PRESS, 1933.
Dyfyniad MLAHURST C.C. THE MECHANISM OF CREATIVE EVOLUTION. I. CAMBRIDGE UNIVERSITY PRESS, 1933.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.