Não informado. (1999). Miscellaneous Publications. U.S. Department of Commerce, National Bureau of Standards.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Miscellaneous Publications. Washington: U.S. Department of Commerce, National Bureau of Standards, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Miscellaneous Publications. U.S. Department of Commerce, National Bureau of Standards, 1999.
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