Performance Enhancement by Design

year of pub­li­ca­ti­onISBNauthor(s)title
2006978-0-9787521-0-1Janet WilliamsNail Your Next Audition, the Ultimate 30-Day Guide for Singers
2008978-0-9787521-1-8Janet WilliamsErfolgreich Vorsingen! Der 30-Tage Countdown zum Abheben (German Edition)