Biblioteca Científica Salvat. Salvat.
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Dyfyniad Arddull Chicago
Biblioteca Científica Salvat. Barcelona: Salvat.
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Dyfyniad MLA
Biblioteca Científica Salvat. Salvat.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.