| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Communication Plus: How to Speak So People Will Listen | 978-0-8307-3931-8 (0-8307-3931-9) | 2006 | Dr. Marita Littauer |
| Personality Plus: How to Understand Others by Understanding Yourself | 978-1-85424-509-0 (1-85424-509-0) | 2007 | |
| Wired That Way Companion Workbook: A Comprehensive Guide to Understanding and Maximizing Your Personality Type | 978-0-8307-3926-4 (0-8307-3926-2) | 2006 | Dr. Marita Littauer |