Não informado. (2012). Publications of the Yerkes Observatory. University of Chicago Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Publications of the Yerkes Observatory. Chicago, Ill: University of Chicago Press, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Publications of the Yerkes Observatory. University of Chicago Press, 2012.
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