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John Doerr Measure What Matters: How Google, Bono, and the Gates Foundation Rock the World with OKRs

Peter F. Drucker The Effective Executive: The Definitive Guide to Getting the Right Things Done (Harperbusiness Essentials)

Ben Horowitz The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers

David H. Maister Managing The Professional Service Firm

Brett Tremblyx.com

John Doerr Measure What Matters: How Google, Bono, and the Gates Foundation Rock the World with OKRs