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Dyfyniad APA
(1991). Science year 1991: A review of science and technology during the 1990 school year. World Book, Inc.
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Dyfyniad Arddull Chicago
Science Year 1991: A Review of Science and Technology During the 1990 School Year. Chicago: World Book, Inc, 1991.
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Dyfyniad MLA
Science Year 1991: A Review of Science and Technology During the 1990 School Year. World Book, Inc, 1991.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.