1. Cabinet Office, Government of Japan. (1994). Kokumin-seikatsu-ni-kansuru-yoron-chyousa. Retrieved from
http://survey.gov-online.go.jp/h06/H06-05-06-01.html
. Accessed 12 Feb 2019.
2. Central Research Services, Inc. (2012). “Ikigai”-ni-kansuru-yoron-chyousa. Retrieved from
http://www.crs.or.jp/backno/No636/6362.htm
. Accessed 12 Feb 2019.
3. Cohen, J. (1992). A power primer. Psychological Bulletin,112(1), 155–159.
4. Corbin, J., & Strauss, A. (2015). Basics of qualitative research: Techniques and procedures for developing grounded theory (4th ed.). Thousand Oaks, CA: Sage.
5. Delle Fave, A., Brdar, I., Freire, T., Vella-Brodrick, D., & Wissing, M. P. (2011). The eudaimonic and hedonic components of happiness: Qualitative and quantitative findings. Social Indicators Research,100, 185–207.