The American ephemeris and nautical almanac.
APA Citation
United States Naval Observatory. Nautical Almanac Office. The American ephemeris and nautical almanac. Washington: U.S. Govt. Print. Off.; For sale by the Supt. of Docs., U.S. Govt. Print. Off.
MLA Citation
United States Naval Observatory. Nautical Almanac Office. The American Ephemeris And Nautical Almanac. Washington: U.S. Govt. Print. Off.; For sale by the Supt. of Docs., U.S. Govt. Print. Off,
Warning: These citations may not always be complete (especially for serials).