Dugan, R., & Cuwen, R. C. (1967). World beneath the sea. National Geographic Society.
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Dyfyniad Arddull Chicago
Dugan, Robert, and Robert C. Cuwen. World Beneath the Sea. National Geographic Society, 1967.
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Dyfyniad MLA
Dugan, Robert, and Robert C. Cuwen. World Beneath the Sea. National Geographic Society, 1967.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.