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Dyfyniad Arddull ChicagoIntroduction to Optics [kasetvideo]. New York : Educational Services Incorporated, 1960.
Dyfyniad MLAIntroduction to Optics [kasetvideo]. New York : Educational Services Incorporated, 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.