-. The American Ephemeris and Nautical Almanac: For the year 1968. Government Printing Office.
Chicago Style (17th ed.) Citation-. The American Ephemeris and Nautical Almanac: For the Year 1968. Government Printing Office.
MLA (8th ed.) Citation-. The American Ephemeris and Nautical Almanac: For the Year 1968. Government Printing Office.
Warning: These citations may not always be 100% accurate.