| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1984 | 978-0-914107-00-2 | Paul W. Robinson · Leo D. Hall | Answers: A Parents' Guidebook for Solving Problems |
| '' | 978-0-914107-01-9 | Paul W. Robinson · Leo D. Hall | Answers: A Parents' Guidebook for Solving Problems (A NAP systems publication) |
| 1993 | 978-0-914107-03-3 | Leo D. Hall | B'Tween: Messages from Michael |
| 1995 | 978-0-914107-04-0 | Jacob, R. Mittleider | 6 Steps to Successful Gardening |