| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| La Escencia de La Comunicacion | 978-970-17-0006-8 (970-17-0006-6) | 1999 | Ron Ludlow |
| The Essence of Effective Communication | 978-0-13-284878-7 (0-13-284878-3) | 1993 | " |
| The Essence of Successful Staff Selection | 978-0-13-284704-9 (0-13-284704-3) | 1993 | " |