Não informado. (1934). Journal of Research of the National Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Research of the National Bureau of Standards. Washington: U.S. Department of Commerce, National Bureau of Standards, 1934.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Research of the National Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards, 1934.
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