(1990). Year Book. The 1990 World Book: A Review of the Events of 1989.The Annual Supplement to The World Book Encyclopedia. The World Book,Inc.
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Citação norma Chicago
Year Book. The 1990 World Book: A Review of the Events of 1989.The Annual Supplement to The World Book Encyclopedia. Chicago: The World Book,Inc, 1990.
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Citação norma MLA
Year Book. The 1990 World Book: A Review of the Events of 1989.The Annual Supplement to The World Book Encyclopedia. The World Book,Inc, 1990.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.