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Richards, E.G. (2013). "Calendars". Dalam Urban, S.E.; Seidelmann, P. K. (penyunting). Explanatory Supplement to the Astronomical Almanac(PDF) (ed. 3rd). Mill Valley, CA: University Science Books. m/s. 585, 590. ISBN978-1-891389-85-6. Diarkibkan daripada yang asal(PDF) pada 2019-04-30. Dicapai pada 2018-07-12. Richards does not explicitly state Anno Domini is the worldwide standard, but does state on page 585 the Gregorian calendar is used throughout the world for secular purposes; the Gregorian calendar is used with the Anno Domini era.
web.archive.org
Richards, E.G. (2013). "Calendars". Dalam Urban, S.E.; Seidelmann, P. K. (penyunting). Explanatory Supplement to the Astronomical Almanac(PDF) (ed. 3rd). Mill Valley, CA: University Science Books. m/s. 585, 590. ISBN978-1-891389-85-6. Diarkibkan daripada yang asal(PDF) pada 2019-04-30. Dicapai pada 2018-07-12. Richards does not explicitly state Anno Domini is the worldwide standard, but does state on page 585 the Gregorian calendar is used throughout the world for secular purposes; the Gregorian calendar is used with the Anno Domini era.