@misc{Ideler_Ludwig_Handbuch_1825,
 author={Ideler, Ludwig},
 address={Berlin},
 howpublished={online},
 year={1825},
 publisher={August Rücker},
 language={ger},
 title={Handbuch der mathematischen und technischen Chronologie. Bd. 1},
 keywords={calendar history, ancient calendar},
}