| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| B2B SEO 2020: The Best Step-by-Step Guide | Plus Workbook, Templates and Writing Resources at Kortoom.io | 978-1-7024-3540-6 (1-7024-3540-7) | 2019 |
| B2B SEO 2020: The Best Stepo-by-Step Guide Plus Workbook, Templates and Writing Resources at Kortoom.io | 978-1-6964-8728-3 (1-6964-8728-5) | 2019 |