1. Akita Prefectural Library. (2013). Akita prefectural library health information area. Retrieved June 11, 2013, from http://www.apl.pref.akita.jp/exhibition/minitenji/index_medical.html
2. Akita Prefecture. (2012). Dai 5 ki Akita-ken kaigo hoken jigyo shien keikaku / Dai 6 ki Akita-ken rojin fukushi keikaku. [The fifth period Akita Prefecture caretaking insurance business support plan/The sixth period Akita Prefecture welfare for the elderly plan]. Retrieved June 11, 2013, from http://www.pref.akita.lg.jp/www/contents/1335851983571/index.html
3. Cabinet Office, Government of Japan. (1995). Basic law on measures for the ageing society. Retrieved June 10, 2013, from http://www8.cao.go.jp/kourei/english/measure/kihon-e.html
4. Cabinet Office, Government of Japan. (2011a). Korei shakai hakusho: 2011. [Annual report on the Ageing Society: 2011]. Tokyo: Insatsu-tsuhan. Retrieved June 10, 2013, from http://www8.cao.go.jp/kourei/whitepaper/w-2011/zenbun/23pdf_index.html
5. Cabinet Office, Government of Japan. (2011b). Heisei 22 nendo koreisha no jutaku to seikatsu kankyo ni kansuru ishiki chosa kekka. [Report of the 2011 opinion survey on the elderly’s housing and living environment]. Retrieved June 5, 2012, from http://www8.cao.go.jp/kourei/ishiki/h22/sougou/zentai/index.html