Calendar

=== Sources ===
* {{citation|article = calendar|title = American Heritage Dictionary|date = 2017|edition = 5th|ref={{harvid|calendar|2017}}|url = https://www.ahdictionary.com/word/search.html?q=calendar}}
* {{citation|title=A Comparative Calendar of the Iranian, Muslim Lunar, and Christian Eras for Three Thousand Years|first=Ahmad|last=Birashk|publisher=Mazda Publishers|year=1993|isbn=978-0-939214-95-2}}
* {{citation|title=High Days and Holidays in Iceland|first=Árni|last = Björnsson|location=Reykjavík|publisher=Mál og menning|year=1995|isbn=978-9979-3-0802-7|oclc=186511596|orig-year=1977}}
* {{citation|last1 = Blackburn |first1 = Bonnie | last2 = Holford-Strevens | first2 = Leofranc | title = The Oxford Companion to the Year | date = 2003 | orig-year = 1999 | edition = corrected reprinting of 1st | publisher = Oxford University Press}}
* {{citation|title=Calendrical Calculations|title-link= Calendrical Calculations |first1=Nachum|last1=Dershowitz|author1-link=Nachum Dershowitz|first2=Edward M|last2=Reingold|author2-link=Edward M. Reingold|publisher=Cambridge University Press|year=2008 |isbn=978-0-521-70238-6}}
* {{citation|title=Explanatory Supplement to the Astronomical Almanac|editor-first=P. Kenneth|editor-last=Seidelmann|publisher=University Science Books|year=1992|chapter=Calendars|chapter-url=https://archive.org/details/131123ExplanatorySupplementAstronomicalAlmanac/page/n301/mode/1up|first=L.E.|last=Doggett|isbn=978-0-935702-68-2}}
* {{citation|title=Mapping Time, the calendar and its history|first=E.G.|last=Richards|publisher=Oxford University Press|year=1998|isbn=978-0-19-850413-9|url-access=registration|url=https://archive.org/details/mappingtimecalen00rich}}
* {{citation|title=Sun, Moon, and Sothis|first=Lynn E.|last=Rose|publisher=Kronos Press|year=1999|isbn=978-0-917994-15-9}}
* {{citation|title=Untersuchungen zur Geschichte der Tibetischen Kalenderrechnung|first=Dieter|last =Schuh|location=Wiesbaden|publisher=Franz Steiner Verlag|year=1973|oclc=1150484|language=de}}
* {{citation|title=The Comprehensive Hebrew Calendar|first=Arthur|last=Spier|publisher=Feldheim Publishers|year=1986|isbn=978-0-87306-398-2}}
* {{citation|first=Eviatar|last=Zerubavel|title=The Seven Day Circle: The History and Meaning of the Week|publisher=University of Chicago Press|year=1985|isbn=978-0-226-98165-9}}