Não informado. (1960). Quarterly Journal of the Royal Astronomical Society. Blackwell Scientific Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Quarterly Journal of the Royal Astronomical Society. London: Blackwell Scientific Publications, 1960.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Quarterly Journal of the Royal Astronomical Society. Blackwell Scientific Publications, 1960.
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