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Dyfyniad Arddull ChicagoHurd, David Leonard, J. J. Kipling, and George I. Schwartz. The Origins and Growth of Physical Science. Baltimore: Penguin Books, 1964.
Dyfyniad MLAHurd, David Leonard, et al. The Origins and Growth of Physical Science. Penguin Books, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.