United States Naval Observatory. Nautical Almanac Office & Royal Greenwich Observatory. Nautical Almanac Office. (1980). The astronomical almanac : data for astronomy, space sciences, geodesy surveying, navigation and other applications / issued by the Nautical Almanac Office (and) Her Majesty's Nautical Almanac Office : 1981: Data for astronomy, space sciences, geodesy surveying, navigation and other applications. US Government Printing Office ;.
Chicago Style (17th ed.) CitationUnited States Naval Observatory. Nautical Almanac Office and Royal Greenwich Observatory. Nautical Almanac Office. The Astronomical Almanac : Data for Astronomy, Space Sciences, Geodesy Surveying, Navigation and Other Applications / Issued by the Nautical Almanac Office (and) Her Majesty's Nautical Almanac Office : 1981: Data for Astronomy, Space Sciences, Geodesy Surveying, Navigation and Other Applications. Washington ; London: US Government Printing Office ;, 1980.
MLA (9th ed.) CitationUnited States Naval Observatory. Nautical Almanac Office and Royal Greenwich Observatory. Nautical Almanac Office. The Astronomical Almanac : Data for Astronomy, Space Sciences, Geodesy Surveying, Navigation and Other Applications / Issued by the Nautical Almanac Office (and) Her Majesty's Nautical Almanac Office : 1981: Data for Astronomy, Space Sciences, Geodesy Surveying, Navigation and Other Applications. US Government Printing Office ;, 1980.