Lummer, O. (1897). Licht und Leuchten.
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Dyfyniad Arddull Chicago
Lummer, Otto. Licht Und Leuchten. Berlin, 1897.
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Dyfyniad MLA
Lummer, Otto. Licht Und Leuchten. 1897.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.