| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| ロジカル・シンキング (Best solution) rojikaru・shinkingu (Best solution) | 978-4-492-53112-9 (4-492-53112-2) | 2001 |
| ロジカル・ライティング (BEST SOLUTION―LOGICAL COMMUNICATION SKILL TRAINING) rojikaru・raiteingu (BEST SOLUTION―LOGICAL COMMUNICATION SKILL TRAINING) | 978-4-492-55554-5 (4-492-55554-4) | 2006 |