1. Agency for Cultural Affairs, Government of Japan Homepage: Japanese Language Policy.
http://www.bunka.go.jp/english/policy/japanese_language/index.html
. Last accessed 17 Nov 2019.
http://www.bunka.go.jp/kokugo_nihongo/sisaku/joho/joho/index.html
2. Otsuki, H.: Language Usage Handbook, ⌈語法指南˩ in Japanese, National Diet Library Digital Collections.
http://dl.ndl.go.jp/info:ndljp/pid/992861?itemId=info%3Andljp%2Fpid%2F992861&__lang=en
(1897). Last accessed 10 Dec 2019
3. Tokieda, M.: Principle of Japanese Language, in Japanese, Iwanami Bunko (2007)
4. Mori, O.: View of Kana Usage (仮名遣意見), in Japanese, in Chikuma Collection, Chikuma Shobo (1971). Aozora Bunko H.P. (
http://www.aozora.gr.jp
).
https://www.aozora.gr.jp/cards/000129/files/677_22837.html
. Last accessed 10 Dec 2019
5. Agency for Cultural Affairs, Government of Japan Homepage: Japanese Language Policy. 3000 Data Collection of Kana Usage, Cabinet Notification No.33.
http://www.bunka.go.jp/kokugo_nihongo/sisaku/joho/joho/sisaku/enkaku/enkaku1.html
(1946). Last accessed 04 Dec 2019