1. Amamiya, K. (2021). Koronaka Hinkon no Kiroku: 2020 Nen Kono Kuni no Soko ga Nuketa [Records of poverty under COVID: This country was bankrupted in the year of 2020]. Kamogawa Shuppan.
2. Ando, K, & Ishikawa, A. (Eds.). (1980). Nihonteki Keiē no Tenki: Nenkōsē to Shūshinkoyō wa Dōnaruka [A turning point in the Japanese management: What will happen to the seniority and life-time employment systems]. Yūhikaku.
3. Aoki, H. (2000). Gendai Nihon no Toshikasō [The lower classes of contemporary Japan]. Akashi Shoten.
4. Eguchi, E. (1979–80). Gendai no “Tēshotoku Sha Sō,” jyō, chū, ge [The “low-income strata” today, Volumes 1–3]. Mirai Sha.
5. Estevez-Abe, M. (2008). Welfare and capitalism in postwar Japan. Cambridge University Press.