Não informado. (1974). Explorations in economic research. National Bureau of Economic Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Explorations in Economic Research. New York: National Bureau of Economic Research, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Explorations in Economic Research. National Bureau of Economic Research, 1974.
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