| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Joho shinshakai no nyu bijinesu | 978-4-06-202140-1 (4-06-202140-4) | ||
| Kore made no hyakunen kore kara no hyakunen =: This century and the comming century | 978-4-06-207912-9 (4-06-207912-7) | 1996 | Keitarō Hasegawa |
| Nihon no shinro o tou | 978-4-06-206764-5 (4-06-206764-1) | 1993 | |