| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1999 | 978-0-9664302-1-9 | Susan Berkley | Speak to Influence: How to Unlock the Hidden Power of Your Voice |
| 2002 | 978-0-9664302-2-6 | Norberto R. Keppe | The Origin of Illness: Psychological, Physical and Social |
| 2004 | 978-0-9664302-5-7 | Susan Berkley | Speak to Influence: How to Unlock the Hidden Power of Your Voice |