APA
United States Naval Observatory. Nautical Almanac Office, . (1980). The American ephemeris and nautical almanac. Washington, D. C: Print Off.
Chicago
United States Naval Observatory. Nautical Almanac Office, . 1980. The American ephemeris and nautical almanac. Washington, D. C: Print Off.
Harvard
United States Naval Observatory. Nautical Almanac Office, . (1980). The American ephemeris and nautical almanac. Washington, D. C: Print Off.
MLA
United States Naval Observatory. Nautical Almanac Office, . The American ephemeris and nautical almanac. Washington, D. C: Print Off. 1980.
