Cofnodi Dyfyniadau
Dyfyniad APA
(19). Portugal. Edições SNI.
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Dyfyniad Arddull Chicago
Portugal. Edições SNI, 19.
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Dyfyniad MLA
Portugal. Edições SNI, 19.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.