SOME WORKS
- The Isle of Masks (Ulysses Moore #4)
- Klub Podróżników w Wyobraźni (Ulysses Moore, #12)
- Kamienni Strażnicy (Ulysses Moore #5)
- Marlene
- The First Actress
- The Future of War: A History
- Ukraine and the Art of Strategy
- Fate of the Fallen Sneak Peek
- Before Happiness: How Creating a Positive Reality First Amplifies Your Levels of Happiness and Success
- Big Potential: How Transforming the Pursuit of Success Raises Our Achievement, Happiness, and Well-Being