| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The 20 Percent Solution: Create a Website for Almost Passive Income: Step-by-step guide to launch, leverage up, then successfully manage an online business, using 20 percent of your time | 978-0-692-23308-5 (0-692-23308-3) | 2014 |
| The 20 Percent Solution: Create a Website for Almost Passive Income: Step-by-step guide to launch, leverage up, then successfully manage an online business, using 20 percent of your time | 978-0-692-23480-8 (0-692-23480-2) | 2014 |