Cofnodi Dyfyniadau
Dyfyniad APA
(17). [Ensaio sobre Matemática e Aritmética].
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Dyfyniad Arddull Chicago
[Ensaio Sobre Matemática E Aritmética]. 17.
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Dyfyniad MLA
[Ensaio Sobre Matemática E Aritmética]. 17.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.