WorkLife with Adam Grant. Organisational Psychologist
Brené Brown - The Power of Vulnerability
Liz Wiseman, Multipliers: How the Best Leaders Make Everyone Smarter
Carol S. Dweck, Mindset: The New Psychology of Success
Julie Zhuo, The Making of a Manager: What to Do When Everyone Looks to You
Simon Sinek, Leaders Eat Last: Why Some Teams Pull Together and Others Don't
Patrick Lencioni, The Five Dysfunctions of a Team: A Leadership Fable
Brené Brown, Dare to Lead: Brave Work. Tough Conversations. Whole Hearts.
Jim Collins, Good to Great
Edward de Bono, Six Thinking Hats
Atomic Habits, James Clear
Richard Potter, Director of Digital Strategy, Microsoft
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)