APA (7th ed.) Zitazioa
(1856). Astronomical Observations of the U.S. Naval Observatory.
Chicago Style (17th ed.) Zitazioa
Astronomical Observations of the U.S. Naval Observatory. Washington, 1856.
MLA (9th ed.) Zitazioa
Astronomical Observations of the U.S. Naval Observatory. 1856.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.