Não informado. (1855). Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Annals of the Astronomical Observatory of Harvard College. Cambridge, Mass: Harvard College Observatory, 1855.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory, 1855.
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