Various. Scientific American Supplement No. 822, October 3, 1891.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVarious. Scientific American Supplement No. 822, October 3, 1891.
एमएलए (9वां संस्करण) प्रशस्ति पत्रVarious. Scientific American Supplement No. 822, October 3, 1891.
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