Sources

The data to the different ones calendars do come not alone from my feather. Therefore, I indicated the sources here to all calendars.

Name calendar

Onomatology

Encyclopedia

Time board of the calendar evolution

The Julian date

The Egyptian calendar

The Jewish calendar

The calendar of the Maya

The old Roman calendar

The Numanian calendar

The calendar of the Roman republic

The calendar of Ptolemaios IIIrd Euergetes Ist

The Julian calendar

The Ethiopical calendar

The Coptic calendar

The Armenian calendar

The old Persian calendar

The Persian calendar

The Islamic calendar

The calendar of Yazdegar IIIrd

The calendar of Omar Chayyam

The Lilian date

The Gregorian calendar

The French revolutionary calendar

The positivist calendar

The modified Julian date

The Cotsworth calendar

The world calendar

The truncated Julian date

The Annus Novus Decimal Calendar

The 13 month calendar from www.calendarreform.org

The 12 month calendar I from www.calendarreform.org

The 12 month calendar II from www.calendarreform.org

The 12 month calendar II from www.calendarreform.org

The Aristean perpetual calendar