(2010). The world book encyclopedia. World Book Inc..
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Dyfyniad Arddull Chicago
The World Book Encyclopedia. Chicago: World Book Inc., 2010.
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Dyfyniad MLA
The World Book Encyclopedia. World Book Inc., 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.