Sigwart, C. (1873). Logik.
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Dyfyniad Arddull Chicago
Sigwart, Christoph. Logik. Tübingen, 1873.
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Dyfyniad MLA
Sigwart, Christoph. Logik. 1873.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.