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* {{en}} [https://web.archive.org/web/20040401234715/http://astro.nmsu.edu/~lhuber/leaphist.html Calendars and their History] - L. E. Doggett
* {{en}} [http://www.rog.nmm.ac.uk/leaflets/new_mill.html The New Millennium] - Royal Greenwich Observatory
* {{en}} [https://web.archive.org/web/20010305143920/http://aa.usno.navy.mil/AAaa/faq/docs/millennium.html Millennium] - US Naval Observatory
* {{en}} [http://www.timeanddate.com/counters/mil2000.html Difference Between Millennium and 2000] - Time and Date.com
* {{en}} [http://kilby.stanford.edu/~rvg/millennium.html The third millennium starts on January 1 of the year 2001] - Rob van Glabbeek
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