Cofnodi Dyfyniadau
Dyfyniad APA
[T]ractatum de sp[h]era [quatuor?] cap[itu]lis.
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Dyfyniad Arddull Chicago
[T]ractatum De Sp[h]era [quatuor?] Cap[itu]lis.
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Dyfyniad MLA
[T]ractatum De Sp[h]era [quatuor?] Cap[itu]lis.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.