Não informado. (1970). Commerce today. U.S. Department of Commerce.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Commerce Today. Washington: U.S. Department of Commerce, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Commerce Today. U.S. Department of Commerce, 1970.
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