Não informado. (1964). Training in business and industry. Gellert Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Training in Business and Industry. New York: Gellert Publishing, 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Training in Business and Industry. Gellert Publishing, 1964.
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