1. Cabinet Office: 2002, White Paper on National Life (Gyosei, Tokyo) (in Japanese)
2. Cabinet Office: 2003, White Paper on National Life (Gyosei, Tokyo) (in Japanese)
3. Cabinet Office: 2005, FY2004 Annual Report on the State of Formation of a Gender-Equal Society (National Printings, Tokyo) (in Japanese)
4. Cabinet Office: 2007, FY2006 Annual Report on the State of Formation of a Gender-Equal Society (National Printings, Tokyo) (in Japanese)
5. Chunichi Shinbun: 2002, ‹5.9%: Worst Male Unemployment Rate’, 29 November 2002 (in Japanese)