References
- Ochiai (2022) 漢字字形史字典【教育漢字対応版】 (Dictionary of the historical evolution of kanji forms: Edition covering all Elementary school characters), 落合淳思 Ochiai Atsushi. 東方書店 Tōhō Shoten. Tōkyō Metropolis, 2022.
- Xiaoxuetang Database <https://xiaoxue.iis.sinica.edu.tw/>