| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| The Private Investigator 6-Copy Counter | 978-0-399-53219-1 (0-399-53219-6) | 2005 |
| The Private Investigator Handbook: The Do-It-Yourself Guide to Protect Yourself, Get Justice, or Get Even | 978-0-399-53169-9 (0-399-53169-6) | 2005 |