Here are a few books on leadership that I recommend:
The No Asshole Rule: Building a Civilized Workplace and Surviving One That Isn’t
Robert Sutton
The Knowing-Doing Gap: How Smart Companies Turn Knowledge into Action
Robert Sutton and Jeffrey Pfeffer
Leadership Is An Art
Max DePree
Committed Teams: Three Steps to Inspiring Passion and Performance
Mario Moussa
The Art of Thinking Clearly
Rolf Dobelli
Quiet: The Power of Introverts in a World That Can’t Stop Talking
Susan Cain
Learning Leadership: The Five Fundamentals of Becoming an Exemplary Leader
James Kouzes and Barry Posner
The Leadership Challenge: How to Make Extraordinary Things Happen in Organizations
James Kouzes and Barry Posner
Mindset: The New Psychology of Success
Carol S. Dweck
Leading Continuous Change: Navigating the Churn in the Real World
Bill Pasmore
What Millennials Want From Work
Jennifer Deal and Alec Levenson
The Achievement Habit: Stop Wishing, Start Doing. Take Command of Your Life
Bernard Roth
Rookie Smarts: Why Learning Beats Knowing in the New Game of Work
Liz Wiseman
Drive: The Surprising Truth About What Motivates Us
Daniel Pink
The Power of Full Engagement: Managing Energy, Not Time, is the Key to High Performance and Personal Renewal
Jim Loehr and Tony Schwartz
Power: Why Some People Have It- and Others Don’t
Jeffrey Pfeffer
Start With Why: How Great Leaders Inspire Everyone to Take Action
Simon Sinek
The End of Leadership
Barbara Kellerman
Leadership Jazz: The Essential Elements of a Great Leader
Max DePree