The following books have had a big impact on me. Due to my ADD, reading was not enjoyable to me. It felt like torture.
I discovered audiobooks, which opened the door to enjoying books. I use Audible.com, but there are other options. I often will buy the traditional book and read along while listening to the audiobook, this is my most effective way to learn.
Regardless of what works for you, I suggest you read or listen to the following.
The Secret by Rhonda Byrne
Ask and It Is Given by Esther and Jerry Hicks
The Obstacle Is The Way by Ryan Holiday
The 5 Second Rule by Mel Robbins
Playing the Matrix by Mike Dooley
The Daily Stoic by Ryan Holiday
I read/listen to many books a year, these 6 books played a big role in develop of my philosophy in life and my coaching practice, I have listened to each one multiple times.