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Dyfyniad Arddull ChicagoConstant, F. Woodbridge. Fundamental Laws of Physics. Reading, Mass: Addison-Wesley, 1963.
Dyfyniad MLAConstant, F. Woodbridge. Fundamental Laws of Physics. Addison-Wesley, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.