Não informado. (1969). Bulletin of the American Astronomical Society. American Institute of Physics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the American Astronomical Society. New York: American Institute of Physics, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the American Astronomical Society. American Institute of Physics, 1969.
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