APA (7th ed.) Citation

United States Naval Observatory. (1851). Astronomical observations made at U.S. Naval Observatory, during years 1851 and 1852. [publisher not identified].

Chicago Style (17th ed.) Citation

United States Naval Observatory. Astronomical Observations Made at U.S. Naval Observatory, During Years 1851 and 1852. [Washington]: [publisher not identified], 1851.

MLA (9th ed.) Citation

United States Naval Observatory. Astronomical Observations Made at U.S. Naval Observatory, During Years 1851 and 1852. [publisher not identified], 1851.