Werth, E. (1909). Das Eiszeitalter.
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Dyfyniad Arddull Chicago
Werth, Emil. Das Eiszeitalter. Leipzig, 1909.
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Dyfyniad MLA
Werth, Emil. Das Eiszeitalter. 1909.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.