| title | media type | ISBN-13 | year of publica- tion |
|---|---|---|---|
| How to Manage People | Paperback | 978-0-09-151831-8 | 1984 |
| Perfect Business Plan | " | 978-1-84413-148-8 | 2003 |
| The 24 Hour Business Plan | " | 978-0-7126-6969-6 | 2000 |
| The 24 Hour Business Plan | Hardcover | 978-0-09-174206-5 | 1990 |