Não informado. (1931). Credit and financial management. National Association of Credit Management.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Credit and Financial Management. New York: National Association of Credit Management, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Credit and Financial Management. National Association of Credit Management, 1931.
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