(1981). World health statistics annual 1981: Vital statistics and causes of death. World Health Organization.
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Citação norma Chicago
World Health Statistics Annual 1981: Vital Statistics and Causes of Death. Genéve: World Health Organization, 1981.
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Citação norma MLA
World Health Statistics Annual 1981: Vital Statistics and Causes of Death. World Health Organization, 1981.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.