APA
Her Majesty's Nautical Almanac Office, . (1961). Explanatory Supplement to The Astronomical Ephemeris and The American Ephemeris and Nautical Almanac prepared jpintly by the Nautical Almanac Offices of the United Kingdom and The United States of America. London: Her Majesty's Stationery Office.
Chicago
Her Majesty's Nautical Almanac Office, . 1961. Explanatory Supplement to The Astronomical Ephemeris and The American Ephemeris and Nautical Almanac prepared jpintly by the Nautical Almanac Offices of the United Kingdom and The United States of America. London: Her Majesty's Stationery Office.
Harvard
Her Majesty's Nautical Almanac Office, . (1961). Explanatory Supplement to The Astronomical Ephemeris and The American Ephemeris and Nautical Almanac prepared jpintly by the Nautical Almanac Offices of the United Kingdom and The United States of America. London: Her Majesty's Stationery Office.
MLA
Her Majesty's Nautical Almanac Office, . Explanatory Supplement to The Astronomical Ephemeris and The American Ephemeris and Nautical Almanac prepared jpintly by the Nautical Almanac Offices of the United Kingdom and The United States of America. London: Her Majesty's Stationery Office. 1961.