National Geographic Society. (2004). Atlas National Geographic (1a. ed.).
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Dyfyniad Arddull Chicago
National Geographic Society. Atlas National Geographic. 1a. ed. 2004.
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Dyfyniad MLA
National Geographic Society. Atlas National Geographic. 1a. ed. 2004.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.