1. Clean Yokosuka Friendship Association. (2005). Progress of Clean Yokosuka Movement for 30 years.
2. Clean Yokosuka Friendship Association. (2007). Annual Report of Activities under the Clean Yokosuka Movement.
3. Economic Planning Agency, Prime Minister’s Office, Government of Japan. (1997). Monetary Valuation of Unpaid Labor. http://www5.cao.go.jp/j-j/doc/unpaid-j-j.html .
4. Environment Agency, Prime Minister’s Office, Government of Japan. (1969–1971). White Paper on Environmental Pollutions.
5. Environment Agency, Prime Minister’s Office, Government of Japan. (1972–2000). White Paper on the Environment.