(1981). Science year :1981: The World book science annual. Field Enterprises Educational Corporation.
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Citação norma Chicago
Science Year :1981: The World Book Science Annual. Chicago: Field Enterprises Educational Corporation, 1981.
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Citação norma MLA
Science Year :1981: The World Book Science Annual. Field Enterprises Educational Corporation, 1981.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.