Não informado. (1928). Bureau of Standards Journal Research. U.S. Department of Commerce, National Bureau of Standards.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bureau of Standards Journal Research. Washington: U.S. Department of Commerce, National Bureau of Standards, 1928.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bureau of Standards Journal Research. U.S. Department of Commerce, National Bureau of Standards, 1928.
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