[1] 沖縄の歴史情報 第4巻 (2016-02-07 21:09:15 +09:00 版) http://www.okinawa.oiu.ac.jp/cd/dai-4/4-4.htm

[2] 橡4104.PDF - 4104.pdf, 2014-02-14T08:04:32.000Z, 2021-09-12T04:05:16.972Z http://www.tulips.tsukuba.ac.jp/limedio/dlam/B95/B952214/1/dai-1/mokuji/4104.pdf

[3] eKanji misc. data, 2022-05-05T14:25:17.000Z, 2000-08-24T10:19:45.451Z https://web.archive.org/web/20000824101917/http://www.zinbun.kyoto-u.ac.jp/~ekanji/data.html