Osterbrock, D. E. (1997). Yerkes Observatory, 1892-1950: The birth, near death, and resurrection of a scientific research institution. University of Chicago Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOsterbrock, Donald E. Yerkes Observatory, 1892-1950: The Birth, Near Death, and Resurrection of a Scientific Research Institution. Chicago: University of Chicago Press, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रOsterbrock, Donald E. Yerkes Observatory, 1892-1950: The Birth, Near Death, and Resurrection of a Scientific Research Institution. University of Chicago Press, 1997.
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