(1991). <The> 1991 World Book Year Book: <The> Annual Supplement to The World Book Encyclopedia (1. ed.). World Book.
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Citação norma Chicago
<The> 1991 World Book Year Book: <The> Annual Supplement to The World Book Encyclopedia. 1. ed. Chicago: World Book, 1991.
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Citação norma MLA
<The> 1991 World Book Year Book: <The> Annual Supplement to The World Book Encyclopedia. 1. ed. World Book, 1991.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.