S.K. · S. Keßler · Syd and Ellen Kessler
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Perfect System of Parenting | 978-0-9783286-2-7 (0-9783286-2-0) | 2007 | Ellen Kessler |
| Vibes: The Scientific Secret to Building Powerful Relationships and Achieving Extraordinary Results in Sales and Marketing | 978-0-9780554-0-0 (0-9780554-0-3) | 2006 | David Morrison |