- National Tax Agency
- National Tax Tribunal
- Zeiken.Co.
- Small and Medium Enterprise Agency
- Kanagawa Federation of Small Buisiness Association
- The Japanese Institute of Certified Public Accountants
- Japan Federation of Certified Public Tax Accountant's Associations
- Tokyo-chiho Certified Public Tax Accountants Association
- Teikoku Databank Ltd.
- Japan Broadcasting Corporation
- Nikkei Inc.
- Kanagawa Shimbun
- Taiyu General Audit Corporation
