Não informado. (2002). Circular of the United States Naval Observatory. U.S. Naval Observatory.
Cita Chicago Style (17a ed.)Não informado. Circular of the United States Naval Observatory. Washington: U.S. Naval Observatory, 2002.
Cita MLA (8a ed.)Não informado. Circular of the United States Naval Observatory. U.S. Naval Observatory, 2002.
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