Everything by Simon Sinek, but most important for me is "Leaders Eat Last" [0]. I haven't read the last one (The Infinite Game), but I've heard it's pretty good as well. Also Extreme Ownership [1] and Dichotomy of Leadership [2] by Jocko Willink and Leif Babin. All of these books had tremendous impact on me as a leader and I highly recommend them. [0]: https://www.amazon.com/Leaders-Eat-Last-Together-Others/dp/B... […
I had just finished (Finite and Infinite Games) by James P. Carse. He normally does a great job distilling information from mulitple sources, but in this case it seemed like he added nothing, condensed nothing, and in my opinion came really close to just rewriting the first 1/2 of someone else's book and calling it a new thing.
I'm not calling it plagiarism, he's obviously too smart to cross that line. But if you read the books you will see what I mean.