(1978). <The> Elderly population: 1976 : estimates by county. U. S. Department of health, educationaad welfare.
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Citação norma Chicago
<The> Elderly Population: 1976 : Estimates by County. Washington: U. S. Department of health, educationaad welfare, 1978.
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Citação norma MLA
<The> Elderly Population: 1976 : Estimates by County. U. S. Department of health, educationaad welfare, 1978.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.