(1990). Science Year 1991: The World Book Annual. Science Supplement. A review of Science and Technology During the 1990 School Year. The World Book,Inc.
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Citação norma Chicago
Science Year 1991: The World Book Annual. Science Supplement. A Review of Science and Technology During the 1990 School Year. Chicago: The World Book,Inc, 1990.
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Citação norma MLA
Science Year 1991: The World Book Annual. Science Supplement. A Review of Science and Technology During the 1990 School Year. The World Book,Inc, 1990.
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