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Dyfyniad APA
(1982). Science year :1978: The World book science annual. Field Enterprises Educational Corporation.
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Dyfyniad Arddull Chicago
Science Year :1978: The World Book Science Annual. Chicago: Field Enterprises Educational Corporation, 1982.
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Dyfyniad MLA
Science Year :1978: The World Book Science Annual. Field Enterprises Educational Corporation, 1982.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.