Não informado. (2002). Circular of the United States Naval Observatory. U.S. Naval Observatory.
Chicago-viite (17. p.)Não informado. Circular of the United States Naval Observatory. Washington: U.S. Naval Observatory, 2002.
MLA-viite (8. p.)Não informado. Circular of the United States Naval Observatory. U.S. Naval Observatory, 2002.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.