Não informado. (1991). Economic & Financial Computing. European Economics and Financial Centre.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Economic & Financial Computing. London: European Economics and Financial Centre, 1991.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Economic & Financial Computing. European Economics and Financial Centre, 1991.
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