APA (7th ed.) Citation

United States Naval Observatory. (1976). United States Naval Observatory. U.S. Dept. of Defense, Dept. of the Navy, Naval Observatory.

Chicago Style (17th ed.) Citation

United States Naval Observatory. United States Naval Observatory. Washington: U.S. Dept. of Defense, Dept. of the Navy, Naval Observatory, 1976.

MLA (9th ed.) Citation

United States Naval Observatory. United States Naval Observatory. U.S. Dept. of Defense, Dept. of the Navy, Naval Observatory, 1976.