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

Marty Cagan INSPIRED: How to Create Tech Products Customers Love (Silicon Valley Product Group)

Ken Segall Insanely Simple: The Obsession That Drives Apple's Success

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