[1] [CITE@ja[【カレンダー】ケルトの暦 - あれ?誰だっけ? - アットウィキ]]
([TIME[2020-09-13T13:35:29.000Z]])
<https://w.atwiki.jp/alonsodeleyva/pages/44.html>

[2] [CITE@en[Celtic calendar - Wikipedia]]
([TIME[2020-09-07T00:26:54.000Z]], [TIME[2020-09-13T13:35:43.905Z]])
<https://en.wikipedia.org/wiki/Celtic_calendar>

[3] [CITE[ケルト■暦について]]
([TIME[2003-11-07T00:52:50.000Z]], [TIME[2020-09-13T13:36:39.794Z]])
<http://www2t.biglobe.ne.jp/~shin/kyoro_room/erin/calendar.html>

[4] [CITE[C008]]
([TIME[2017-08-15T05:00:45.000Z]], [TIME[2020-11-12T04:55:38.951Z]])
<http://metatron.la.coocan.jp/zone-04a/C008.htm>