1. The Association of Health Insurance Societies, various years. Kenko Hoken Kumiai Jigyo Nenpo [Annual Report on Health Insurance Societies] (in Japanese).
2. The Association of National Health Insurance, various years. Kokumin Kenko Hoken no Jittai [Report on National Health Insurance] (in Japanese).
3. Kenko-hoken Kumiai ni okeru Rojinhoken Kyoshutsukin no Genjo [The effects of the Elderly's Health Care Financing System on Health Insurance Societies in Japan];Abe;Iryou keizai kenkyu [Japanese Journal of Health Economics and Policy],2000
4. Kumiai-kansho hoken no risk bunsan kinou ni-tuite [On risk sharing functions of Health Insurance Societies in Japan];Abe;Kikan shakai hosho kenkyu [Quarterly Journal of Social Security Research],2000
5. The effect of a redistribution system for health care for the elderly on the financial performance of health insurance societies in Japan;Babazono;International Journal of Technology Assessment in Health Care,1998