(1969). Statistical yearbook 1968: 20 issue. Statistical Office of the UN.
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Citação norma Chicago
Statistical Yearbook 1968: 20 Issue. New York: Statistical Office of the UN, 1969.
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Citação norma MLA
Statistical Yearbook 1968: 20 Issue. Statistical Office of the UN, 1969.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.