Cofnodi Dyfyniadau
Dyfyniad APA
May Alfredo Oscar de Azevedo, Lorsignol G, & Portugal Direcção Geral dos Trabalhos Geodésicos do Reino. Portugal geológico.
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Dyfyniad Arddull Chicago
May Alfredo Oscar de Azevedo, Lorsignol G, and Portugal Direcção Geral dos Trabalhos Geodésicos do Reino. Portugal Geológico.
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Dyfyniad MLA
May Alfredo Oscar de Azevedo, et al. Portugal Geológico.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.