World Book, Inc. (2004). The World Book Encyclopedia: Volume -6. World Book, Inc.
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Dyfyniad Arddull Chicago
World Book, Inc. The World Book Encyclopedia: Volume -6. Chicago: World Book, Inc, 2004.
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Dyfyniad MLA
World Book, Inc. The World Book Encyclopedia: Volume -6. World Book, Inc, 2004.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.