| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Ultra Mindset: An Endurance Champion's 8 Core Principles for Success in Business, Sports, and Life | 978-0-7382-1814-4 (0-7382-1814-6) | 2015 | John Hanc |
| Ultranastawienie | 978-83-7229-475-3 (83-7229-475-5) | 2015 | |