- Music Theory Made EasyDavid Harp
- Play the harmonica--today!David Harp
- The three minute meditatorDavid Harp
- The new three minute meditatorDavid Harp
- Instant Chromatic HarmonicaDavid Harp
- MetaPhysical fitness!David Harp
- Music Theory Made Easy New Edition (Reference)David Harp
- Mindfulness to goDavid Harp
- Neural path therapyMatthew McKay, David Harp
- Instant Blues HarmonicaDavid Harp
- The Pocket Harmonica Songbook (Harmonica)David Harp
- Three Minutes To Chromatic Harmonica (Three Minutes To)David Harp
