| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1990 | 978-0-912732-67-1 | Duane Shinn | The Amazing Secret of Free Advertising: How to Get Write-Ups Galore All over the Country/With Audio Cassette |
| 2006 | 978-0-912732-68-8 | '' | Piano Chords & Progressions:: The Secret Backdoor to Exciting Piano Playing! |