Cofnodi Dyfyniadau
Dyfyniad APA
(1931). Carta de Portugal. Sociedade Nacional de Fósforos].
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Dyfyniad Arddull Chicago
Carta De Portugal. Sociedade Nacional de Fósforos], 1931.
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Dyfyniad MLA
Carta De Portugal. Sociedade Nacional de Fósforos], 1931.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.