Playing to Win: How strategy really works is the best book on strategy I have ever read. Lafley is a former CEO of Proctor and Gamble and Martin is an academic at the University of Toronto. They worked together when Lafley was CEO.
This book provides real hands on ideas and methods to build a strategy for a company, organization or even a club. The first concept that they identify is that strategy is making limiting choices. That is decide what not to do and where not to compete. Only after making these choices are you ready to implement other strategic activities. They follow all of this up with concrete actions to take as well as examples from their time at P&G