Robert Gerwarth · Robert Girard · Robert Girardi · Roberto Gerhard
| title | media type | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|---|
| Opportunities in Music Careers, Revised Edition | Hardcover | 978-0-07-138716-3 (0-07-138716-1) | 2002 |
| Opportunities in Music Careers, Revised Edition | Paperback | 978-0-07-138717-0 (0-07-138717-X) | 2002 |