Não informado. (1969). AAS photo-bulletin. American Astronomical Society, Working Group on Photographic Materials.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. AAS Photo-bulletin. Rochester, NY: American Astronomical Society, Working Group on Photographic Materials, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. AAS Photo-bulletin. American Astronomical Society, Working Group on Photographic Materials, 1969.
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