Cofnodi Dyfyniadau
Dyfyniad APA
(1998). Lisboa. Everest Editora.
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Dyfyniad Arddull Chicago
Lisboa. Everest Editora, 1998.
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Dyfyniad MLA
Lisboa. Everest Editora, 1998.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.