Cofnodi Dyfyniadau
Dyfyniad APA
(1972). [Carta de Portugal]. s.n.
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Dyfyniad Arddull Chicago
[Carta De Portugal]. s.n, 1972.
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Dyfyniad MLA
[Carta De Portugal]. s.n, 1972.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.