国籍は中国と書く - SERP Analysis

http://skomatsu.free.fr/lecon/national.htm

https://www.tokyo-cci.or.jp/shomei/pdf/kokumei_asia.pdf

https://foreignlang.ecc.co.jp/know/k00121d/

https://www.fruitfulenglish.com/blog/erika-59/

https://jp.taiwantoday.tw/AMP/149/266336

https://www.daito-inc.co.jp/wp-content/uploads/2020/01/kokuseki_code.pdf

https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1044416015

https://ja.wiktionary.org/wiki/%25E5%259B%25BD%25E7%25B1%258D

https://www.efjapan.co.jp/eigo-resources/english-grammar/nationalities/