Fermat’s Last Theorem, Simon Singh
Edward de Bono, Six Thinking Hats
The Innovators Dilemma by Clayton M Christensen
Freakonomics - Steve Dubner
Scaling Up, by Verne Harnish
Better Managers = Better Business, by Pete Fullard
McKinsey Quarterly (a wide range of leadership, management and strategic thinking)
Harvard Business Review (a wide range of leadership thinking)
David Clutterbuck (a good resource for coaching and mentoring thinking)
Stephen Covey: The 7 Habits of Highly Effective People
R. Michael Anderson: Leadership Mindset 2.0
Penny Mallory: Develop Mental Toughness
Nick Howell: Great Coaching Questions
Kate Trafford: Get There, Love Here
Julie Starr: The Coaching Manual