APA-referens (7:e uppl.)

Não informado. (2002). Circular of the United States Naval Observatory. U.S. Naval Observatory.

Chicago-referens (17:e uppl.)

Não informado. Circular of the United States Naval Observatory. Washington: U.S. Naval Observatory, 2002.

MLA-referens (8:e uppl.)

Não informado. Circular of the United States Naval Observatory. U.S. Naval Observatory, 2002.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.