Cofnodi Dyfyniadau
Dyfyniad APA
(1999). [Portugal] ([1ª ed.].). Porto Editora.
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Dyfyniad Arddull Chicago
[Portugal]. [1ª ed.]. Porto Editora, 1999.
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Dyfyniad MLA
[Portugal]. [1ª ed.]. Porto Editora, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.