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Dyfyniad Arddull ChicagoPrentice Hall Science Explorer: Motion, Forces, and Energy. Boston, MA: Pearson Prentice-Hall, 2005.
Dyfyniad MLAPrentice Hall Science Explorer: Motion, Forces, and Energy. Boston, MA: Pearson Prentice-Hall, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.