Cofnodi Dyfyniadau
Dyfyniad APA
(2009). The world almanac and book of facts, 2009. World Almanac Books.
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Dyfyniad Arddull Chicago
The World Almanac and Book of Facts, 2009. New York: World Almanac Books, 2009.
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Dyfyniad MLA
The World Almanac and Book of Facts, 2009. World Almanac Books, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.