G J · G. John · John Gerhold
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| A Plain English Guide to Music Fundamentals: An Outcome Based Approach | 978-1-4652-6853-2 (1-4652-6853-7) | 2015 |
| A Plain English Guide to Music Fundamentals: An Outcome Based Approach | 978-1-4652-2204-6 (1-4652-2204-9) | 2013 |