Não informado. (2000). Technical news from the National Bureau of Standards. U.S. Department of Commerce.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Technical News from the National Bureau of Standards. Washington: U.S. Department of Commerce, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Technical News from the National Bureau of Standards. U.S. Department of Commerce, 2000.
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