Cofnodi Dyfyniadau
Dyfyniad APA
Porto Editora & Bloco Gráfico. (1999). Sistema Solar. Porto Editora.
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Dyfyniad Arddull Chicago
Porto Editora and Bloco Gráfico. Sistema Solar. Porto Editora, 1999.
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Dyfyniad MLA
Porto Editora and Bloco Gráfico. Sistema Solar. Porto Editora, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.