Não informado. (2018). Publications of the Cincinnati Observatory. Cincinnati Observatory.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Publications of the Cincinnati Observatory. Cincinnati, Ohio: Cincinnati Observatory, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Publications of the Cincinnati Observatory. Cincinnati Observatory, 2018.
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