Cofnodi Dyfyniadau
Dyfyniad APA
Schmidt Robert Gordon & Estados Unidos Geological Survey. (1971). Atlas of volcanic phenomena. Geological Survey.
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Dyfyniad Arddull Chicago
Schmidt Robert Gordon and Estados Unidos Geological Survey. Atlas of Volcanic Phenomena. Geological Survey, 1971.
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Dyfyniad MLA
Schmidt Robert Gordon and Estados Unidos Geological Survey. Atlas of Volcanic Phenomena. Geological Survey, 1971.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.