Não informado. (1960). Main Economic Indicators. Department of Economics and Statistics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Main Economic Indicators. Paris: Department of Economics and Statistics, 1960.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Main Economic Indicators. Department of Economics and Statistics, 1960.
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