Brené Brown - The Power of Vulnerability
Simon Sinek - How Great Leaders Inspire Action
Liz Wiseman, Multipliers: How the Best Leaders Make Everyone Smarter
Julie Zhuo, The Making of a Manager: What to Do When Everyone Looks to You
Patrick Lencioni, The Five Dysfunctions of a Team: A Leadership Fable
Brené Brown, Dare to Lead: Brave Work. Tough Conversations. Whole Hearts.
Daniel Goleman, Emotional Intelligence
The Mozart Effect
Miles Davis: Kind of Blue
Brian Eno: Music for Airports
Edward de Bono, Six Thinking Hats
How to Win Friends and Influence People, Dale Carnegie
Better Managers = Better Business, by Pete Fullard
Harvard Business Review (a wide range of leadership thinking)
David Clutterbuck (a good resource for coaching and mentoring thinking)