Não informado. (1918). National Bureau of Standards Handbook. Government Printing Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. National Bureau of Standards Handbook. Washington: Government Printing Office, 1918.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. National Bureau of Standards Handbook. Government Printing Office, 1918.
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