Não informado. (1903). Circular of the Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Circular of the Bureau of Standards. Washington: U.S. Department of Commerce, National Bureau of Standards, 1903.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Circular of the Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards, 1903.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.