| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Barron's Pre-GED | 978-1-4380-0110-4 (1-4380-0110-X) | 2012 | Mark Koch · Karen Miller |
| Basic Skills Workbook For The GED® TEST, TASC, And HiSET | 978-1-4380-0624-6 (1-4380-0624-1) | 2015 | Mark Koch |
| My Strange and Terrible Malady | 978-1-934575-19-2 (1-934575-19-4) | 2008 | |