Maennel, B. (1890). Über Abstraktion.
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Dyfyniad Arddull Chicago
Maennel, Bruno. Über Abstraktion. Jena, 1890.
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Dyfyniad MLA
Maennel, Bruno. Über Abstraktion. 1890.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.