Não informado. (2002). Circular of the United States Naval Observatory. U.S. Naval Observatory.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Circular of the United States Naval Observatory. Washington: U.S. Naval Observatory, 2002.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Circular of the United States Naval Observatory. U.S. Naval Observatory, 2002.
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