(1989). World book encyclopedia of science: Chemistry today. World Book,Inc.
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Dyfyniad Arddull Chicago
World Book Encyclopedia of Science: Chemistry Today. Chicago: World Book,Inc, 1989.
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Dyfyniad MLA
World Book Encyclopedia of Science: Chemistry Today. World Book,Inc, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.