Gapminder for a fact-based world view. [s.n.].
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Dyfyniad Arddull Chicago
Gapminder for a Fact-based World View. [s.l.]: [s.n.].
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Dyfyniad MLA
Gapminder for a Fact-based World View. [s.n.].
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.