Fonseca Zamora, O. M. El Colapso maya.
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Dyfyniad Arddull Chicago
Fonseca Zamora, Oscar M. El Colapso Maya. s.n.t.
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Dyfyniad MLA
Fonseca Zamora, Oscar M. El Colapso Maya.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
