H. Roberts · Howard R · Howard Roberts Lamar · Howard W. Roberts
| title | media type | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|---|
| Guitar Compendium Vol.1 - technique/improvisation/musicianship/theory - The Praxis System - guitar - method - - | Sheet music | 978-0-206-30274-0 (0-206-30274-6) | 2000 | Garry Hagberg | |
| The Praxis System: Guitar Compendium: Technique, Improvisation, Musicianship and Theory | Paperback | 978-0-317-04756-1 (0-317-04756-6) | 1989 | ||
| The Praxis System: Guitar Compendium: Technique, Improvisation, Musicianship and Theory | Taschenbuch | 978-3-89221-020-7 (3-89221-020-9) | 1989 | ||
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