Cofnodi Dyfyniadau
Dyfyniad APA
(1983). Porto. s.n.].
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Dyfyniad Arddull Chicago
Porto. s.n.], 1983.
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Dyfyniad MLA
Porto. s.n.], 1983.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.