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2. 2) Ministry of health, labor and welfare: Summary of survey results of Japanese orphans in China, (As of August 31, 1st year of Reiwa), https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/bunya/engo/seido02/kojitoukei.html (accessed 2020.9.10)(In Japanese) 厚生労働省：中国残留邦人の状況（令和元年 8 月 31 日現在）, https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/bunya/engo/seido02/kojitoukei.html (参照 2020.9.10)
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4. 4) Public interest incorporated foundation, Assistance found of Japanese orphans in China, The support and communication center for Japanese people from China: The result summary of questionnaire survey for second and third generation of Japanese people from China, 2020.5 (In Japanese) 公益財団法人, 中国残留孤児援護基金, 中国帰国者支援・交流センター：中国帰国者二三世質問紙調査の結果概要, 2020.5
5. 5) Tadashi Toyama: Identity and milieu: a study of relocation focusing on reciprocal changes in elderly people and their environment, Department for Building Function Analysis, the Royal Institute of Technology, pp. 13-15, 1988.1