So many good suggestions here! I'll try adding two more

[1] "So Good They Can’t Ignore You" by Cal Newport. It changed the way I look at my career and how I view my personal development.

[2] ADP 6-22 Army Leadership and the Profession by the US Army. Looking past the militaristic stuff, it made me change the way I see leader/subordinate relationships and how to start becoming a person others can depend on and look up to.

[1] https://www.amazon.com/Good-They-Cant-Ignore-You/dp/14555091...

[2] https://www.amazon.com/Army-Doctrine-Publication-Leadership-...