| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2006 | 978-0-9787521-0-1 | Janet Williams | Nail Your Next Audition, the Ultimate 30-Day Guide for Singers |
| 2008 | 978-0-9787521-1-8 | Janet Williams | Erfolgreich Vorsingen! Der 30-Tage Countdown zum Abheben (German Edition) |